cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
How to make yak butter tea
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Livres et lecture
subject: picture book
subject: Animaux
subject: Oiseaux
subject: jackal and crow
subject: Stimuli

description: Elan annotation file for the audio file with the same name. Verified with Zhuma on June 2, 2016
Coulomb gap triptychs, $\sqrt{2}$ effective charge, and hopping transport in periodic arrays of superconductor grains
Creators: name: Chen, Tianran
name: Skinner, Brian
name: Shklovskii, B. I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In granular superconductors, individual grains can contain bound Cooper pairs while the system as a whole is strongly insulating. In such cases the conductivity is determined by electron hopping between localized states in individual grains. Here we examine a model of hopping conductivity in such an insulating granular superconductor, where disorder is assumed to be provided by random charges embedded in the insulating gaps between grains. We use computer simulations to calculate the single-electron and electron pair density of states at different values of the superconducting gap $Δ$, and we identify "triptych" symmetries and scaling relations between them. At a particular critical value of $Δ$, one can define an effective charge $\sqrt{2}e$ that characterizes the density of states and the hopping transport. We discuss the implications of our results for magnetoresistance and tunneling experiments.
description: 11 pages, 7 figures
δηλώσεις μετανοίας στην εφημερίδα Εμπρός
Creators: name: Τσαβδαρα, Σίσσυ
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 23-24 (2020)
Story about a magic frog 1
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Animaux
subject: magic frog
subject: Gesar
subject: Narration
subject: Contes

description: Elan annotation file for the audio file with the same name. Translated and double checked with Zhuma in June 2016
Ευρώπη μετά
Creators: name: Ζαρίκος, Ιάσωνας
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 23-24 (2020)
Nash Equilibria in Quantum Games
Creators: name: Landsburg, Steven E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optimization and Control (math.OC)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 91A05, 81P45 (Primary)

description: For any two-by-two game $\G$, we define a new two-player game $\G^Q$. The definition is motivated by a vision of players in game $\G$ communicating via quantum technology according to a certain standard protocol originally introduced by Eisert and Wilkins [EW]. In the game $\G^Q$, each players' strategy set consists of the set of all probability distributions on the 3-sphere $S^3$. Nash equilibria in this game can be difficult to compute. Our main theorems classify all possible equilibria in $\G^Q$ for a Zariski-dense set of games $\G$ that we call {\it generic games}. First, we show that up to a suitable definition of equivalence, any strategy that arises in equilibrium is supported on at most four points; then we show that those four points must lie in one of a small number of geometric configurations. One easy consequence is that for zero-sum games, the payoff to either player in a mixed strategy quantum equilibrium must equal the average of that player's four possible payoffs.
Electroweak Baryogenesis and Dark Matter with an approximate R-symmetry
Creators: name: Kumar, Piyush
name: Ponton, Eduardo
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: It is well known that R-symmetric models dramatically alleviate the SUSY flavor and CP problems. We study particular modifications of existing R-symmetric models which share the solution to the above problems, and have interesting consequences for electroweak baryogenesis and the Dark Matter (DM) content of the universe. In particular, we find that it is naturally possible to have a strongly first-order electroweak phase transition while simultaneously relaxing the tension with EDM experiments. The R-symmetry (and its small breaking) implies that the gauginos (and the neutralino LSP) are pseudo-Dirac fermions, which is relevant for both baryogenesis and DM. The singlet superpartner of the U(1)_Y pseudo-Dirac gaugino plays a prominent role in making the electroweak phase transition strongly first-order. The pseudo-Dirac nature of the LSP allows it to behave similarly to a Dirac particle during freeze-out, but like a Majorana particle for annihilation today and in scattering against nuclei, thus being consistent with current constraints. Assuming a standard cosmology, it is possible to simultaneously have a strongly first-order phase transition conducive to baryogenesis and have the LSP provide the full DM relic abundance, in part of the allowed parameter space. However, other possibilities for DM also exist, which are discussed. It is expected that upcoming direct DM searches as well as neutrino signals from DM annihilation in the Sun will be sensitive to this class of models. Interesting collider and Gravity-wave signals are also briefly discussed.
description: 50 pages, 10 figures
Καταστατικό, η οργάνωση και η λειτουργία του ΚΚΕ μετά τη Μεταπολίτευση
Creators: name: Βήλου, Αιμιλία
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 23-24 (2020)
Upper limits for the photoproduction cross section for the Phi--(1860) pentaquark state off the deuteron
Creators: name: Egiyan, H.
name: Langheinrich, J.
name: Gothe, R. W.
name: Graham, L.
name: Holtrop, M.
name: Lu, H.
name: Mattione, P.
name: Mutchler, G.
name: Park, K.
name: Smith, E. S.
name: Stepanyan, S.
name: Zhao, Z. W.
name: Collaboration, CLAS
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We searched for the Phi--(1860) pentaquark in the photoproduction process off the deuteron in the Xi- pi- decay channel using CLAS. The invariant mass spectrum of the Xi- pi- system does not indicate any statistically significant enhancement near the reported mass M = 1.860 GeV. The statistical analysis of the sideband-subtracted mass spectrum yields a 90% confidence level upper limit of 0.7 nb for the photoproduction cross section of Phi--(1860) with a consecutive decay into Xi- pi- in the photon energy range 4.5 GeV < Egamma < 5.5 GeV.
Pear story 1
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Livres et lecture
subject: picture book
subject: Animaux
subject: Oiseaux
subject: jackal and crow
subject: Stimuli

description: Elan annotation file for the audio file with the same name. Double checked with Zhuma
Επαγγελματικές δραστηριότητες, χώρος και εθνοτοπική ταυτότητα στους Περιβολιώτες Βλάχους κατά τις αρχές του 20ού αιώνα
Creators: name: Σαββανάκης, Γιώργος
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 23-24 (2020)
Pear story 2
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: non-verbal stimuli
subject: Fruits
subject: Pear story
subject: Stimuli
subject: Narration

description: In this recording, Zhuma tells the pear story (from a video). She is not satisfied with the first recordings and suggests to record the story for the second time
Παιδαγωγικές και κοινωνιολογικές προσεγγίσεις στη σύγχρονη πρωτοπορία
Creators: name: Σταυρούλη, Μαριλή
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 23-24 (2020)
Story about a magic frog 2
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: non-verbal stimuli
subject: Animaux
subject: Frog story
subject: Stimuli
subject: Narration

description: Elan annotation file for the audio file with the same name. Double checked with Zhuma
ελληνική ιστοριογραφία για τη δεκαετία 1940
Creators: name: Αγγελίδης, Αθανάσιος
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 23-24 (2020)
Chameleon
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: non-verbal stimuli
subject: comparative construction
subject: Stimuli
subject: Narration

description: Elan annotation file for the audio file with the same name. Double checked with Zhuma
έννοια του εαυτού στο ύστερο έργο του Michel Foucault
Creators: name: Τζανάκης, Μανόλης
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 23-24 (2020)
Asymptotically Schrödinger Space-Times
Creators: name: Hartong, Jelle
name: Rollier, Blaise
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We first review how asymptotically Schrödinger space-times arise in a natural way by performing a TsT transformation on asymptotically AdS space-times and some of its consequences. We then give a coordinate independent definition of a pure Schrödinger space-time in terms of an AdS metric and an AdS null Killing vector. Then, by analogy with the AdS case, we provide a local and coordinate independent definition of a Schrödinger boundary in terms of a defining function. We use this to construct the Fefferman-Graham expansions of locally Schrödinger space-times.
description: 6 pages, based on a contribution to the Proceedings of the XVII European Workshop on String Theory (Padova, 5-9 September 2011)
Ποιος θυμάται τη Μήτιδα;
Creators: name: Ανδριάκαινα, Ελένη
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 23-24 (2020)
Lizard's tail
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Animaux
subject: Lézards
subject: lizard
subject: Narration
subject: Story

description: Elan annotation file for the audio file with the same name. Double checked with Zhuma
Γαλλική Επανάσταση στο εδώλιο
Creators: name: Τζουρμάνα, Γιάννα
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 21-22 (2019)
Repulsive long-range forces between anisotropic atoms and dielectrics
Creators: name: Shajesh, K. V.
name: Schaden, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate long-range forces between atoms with anisotropic electric polarizability interacting with dielectrics having anisotropic permittivity in the weak-coupling approximation. Unstable configurations in which the force between the objects is repulsive are constructed. Such configurations exist for three anisotropic atoms as well as for an anisotropic atom above a dielectric plate with a hole whose permittivity is anisotropic. Apart from the absolute magnitude of the force, the dependence on the configuration is qualitatively the same as for metallic objects for which the anisotropy is a purely geometric effect. In the weak limit closed analytic expressions for rather complicated configurations are obtained. The non-monotonic dependence of the interaction energy on separation is related to the fact that the electromagnetic Green's dyadic is not positive definite. The analysis in the weak limit is found to also semi-quantitatively explain the dependence of Casimir forces on the orientation of anisotropic dielectrics observed experimentally. Contrary to the scalar case, irreducible electromagnetic three-body energies can change sign. We trace this to the fact that the electromagnetic Green's dyadic is not positive definite.
description: 9 pages
Transport Properties and Electronic Phase Diagram of Single-Crystalline Ca$_{10}$(Pt$_3$As$_8$) ((Fe$_{1-x}$Pt$_x$)$_2$As$_2$)$_5$
Creators: name: Xiang, Z. J.
name: Luo, X. G.
name: Ying, J. J.
name: Wang, X. F.
name: Yan, Y. J.
name: Wang, A. F.
name: Cheng, P.
name: Ye, G. J.
name: Chen, X. H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Sizable single-crystalline samples of Ca$_{10}$(Pt$_3$As$_8$)((Fe$_{1-x}$Pt$_x$)$_2$As$_2$)$_5$ (the 10-3-8 phase) with 0$\leq x
description: 9 pages, 7 figures
Σύγγραμμα περί των Φαναριωτών του Μ. Φ. Ζαλλώνη και η απήχησή του στην οθωνική Ελλάδα
Creators: name: Τσακανίκα, Ελισσάβετ-Ευαγγελία
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 21-22 (2019)
Από τον Καδή στον Ombudsman
Creators: name: Χορμοβίτης, Δημήτρης
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 21-22 (2019)
Στοιχεία θετικισμού στο νεανικό έργο του Marx
Creators: name: Δράκος, Διονύσης
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 21-22 (2019)
Πολιτική Κουλτούρα και Ιδεολογία
Creators: name: Ζαρίκος, Ιάσωνας
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 21-22 (2019)
Ανταλλάσσοντας το λάδι με το στάρι
Creators: name: Στέρπης, Χρήστος
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 21-22 (2019)
κριτική της ιδεολογίας και το παιχνίδι της κλίμακας στο έργο της Μαρία Τοντόροβα
Creators: name: Λυμπεράτος, Ανδρέας
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 21-22 (2019)
The North Wind and the Sun
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Météorologie
subject: north wind & sun
subject: Elicitation
subject: Narration

description: Elan annotation file for the audio file with the same name. Double checked with Zhuma
Mixed Ising ferrimagnets with next-nearest neighbour couplings on square lattices
Creators: name: Selke, W.
name: Ekiz, C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study Ising ferrimagnets on square lattices with antiferromagnetic exchange couplings between spins of values S=1/2 and S=1 on neighbouring sites, couplings between S=1 spins at next--nearest neighbour sites of the lattice, and a single--site anisotropy term for the S=1 spins. Using mainly ground state considerations and extensive Monte Carlo simulations, we investigate various aspects of the phase diagram, including compensation points, critical properties, and temperature dependent anomalies. In contrast to previous belief, the next--nearest neighbour couplings, when being of antiferromagnetic type, may lead to compensation points.
σαινσιμονιστές για την επαναστατημένη Ελλάδα
Creators: name: Φουφουλας, Δημήτρης
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 21-22 (2019)
Constraining the formation of inner bars. Photometry, kinematics and stellar populations in NGC 357
Creators: name: de Lorenzo-Cáceres, A.
name: Vazdekis, A.
name: Aguerri, J. A. L.
name: Corsini, E. M.
name: Debattista, Victor P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Double-barred galaxies are common in the local Universe, with approximately one third of barred spirals hosting an smaller, inner bar. Nested bars have been proposed as a mechanism for transporting gas to the very central regions of the galaxy, trigger star formation and contribute to the growth of the bulge. To test this idea, we perform for the first time a detailed analysis of the photometry, kinematics and stellar populations of a double-barred galaxy: NGC 357. We find that this galaxy is either hosting a pseudobulge or a classical bulge together with an inner disc. We compare the relative mean luminosity-weighted age, metallicity and alpha-enhancement between the (pseudo)bulge, inner bar and outer bar, finding that the three structures are nearly coeval and old. Moreover, the bulge and inner bar present the same metallicity and overabundance, whereas the outer bar tends to be less metal-rich and more alpha-enhanced. These results point out that, rather than the classical secular scenario in which gas and star formation play a major role, the redistribution of the existing stars is driving the formation of the inner structures.
description: 17 pages, 10 figures. Accepted for publication in MNRAS
μνήμη του Ολοκαυτώματος και της Διάσωσης στους "Τρικαλινούς Εβραίους"
Creators: name: Σπύρος, Θεόδωρος
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 21-22 (2019)
Περιεχόμενα τευχών 1-20
Creators: name: Περιεχόμενα, Περιεχόμενα
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
The moduli space of regular stable maps
Creators: name: Robbin, Joel
name: Ruan, Yongbin
name: Salamon, Dietmar
Publisher: name: arXiv
Year: 2012
Subjects: subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 53D45

description: The moduli space of regular stable maps with values in a complex manifold admits naturally the structure of a complex orbifold. Our proof uses the methods of differential geometry rather than algebraic geometry. It is based on Hardy decompositions and Fredholm intersection theory in the loop space of the target manifold.
description: 59 pages, 2 figures
Οδηγίες
Creators: name: Οδηγίες, Οδηγίες
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
GRIT: Graph-based Recall Improvement for Task-oriented E-commerce Queries
Creators: name: Kulkarni, Hrishikesh
name: Kallumadi, Surya
name: MacAvaney, Sean
name: Goharian, Nazli
name: Frieder, Ophir
Publisher: name: arXiv
Year: 2025
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Many e-commerce search pipelines have four stages, namely: retrieval, filtering, ranking, and personalized-reranking. The retrieval stage must be efficient and yield high recall because relevant products missed in the first stage cannot be considered in later stages. This is challenging for task-oriented queries (queries with actionable intent) where user requirements are contextually intensive and difficult to understand. To foster research in the domain of e-commerce, we created a novel benchmark for Task-oriented Queries (TQE) by using LLM, which operates over the existing ESCI product search dataset. Furthermore, we propose a novel method 'Graph-based Recall Improvement for Task-oriented queries' (GRIT) to address the most crucial first-stage recall improvement needs. GRIT leads to robust and statistically significant improvements over state-of-the-art lexical, dense, and learned-sparse baselines. Our system supports both traditional and task-oriented e-commerce queries, yielding up to 6.3% recall improvement. In the indexing stage, GRIT first builds a product-product similarity graph using user clicks or manual annotation data. During retrieval, it locates neighbors with higher contextual and action relevance and prioritizes them over the less relevant candidates from the initial retrieval. This leads to a more comprehensive and relevant first-stage result set that improves overall system recall. Overall, GRIT leverages the locality relationships and contextual insights provided by the graph using neighboring nodes to enrich the first-stage retrieval results. We show that the method is not only robust across all introduced parameters, but also works effectively on top of a variety of first-stage retrieval methods.
description: LLM4ECommerce at WWW 2025
Σημειώματα
Creators: name: Δρούλια, Έλλη
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
Xumi flood story
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: traditional story
subject: Inondations
subject: flood story
subject: Narration

description: Elan annotation file for the audio file with the same name. Double checked with Zhuma
Κατασκευή εννοιών από τους διεθνείς οργανισμούς
Creators: name: Νικολαϊδης, Ευάγγελος
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
«Εντός, εκτός και επί τα αυτά», Εθνικό ανήκειν, ιδιότητα του πολίτη και πολιτική της εξαίρεσης
Creators: name: Νοταράς, Ανδρέας
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
Relative-locality distant observers and the phenomenology of momentum-space geometry
Creators: name: Amelino-Camelia, Giovanni
name: Arzano, Michele
name: Kowalski-Glikman, Jerzy
name: Rosati, Giacomo
name: Trevisan, Gabriele
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the translational invariance of the relative-locality framework proposed in arXiv:1101.0931, which had been previously established only for the case of a single interaction. We provide an explicit example of boundary conditions at endpoints of worldlines, which indeed ensures the desired translational invariance for processes involving several interactions, even when some of the interactions are causally connected (particle exchange). We illustrate the properties of the associated relativistic description of distant observers within the example of a $κ$-Poincaré-inspired momentum-space geometry, with de Sitter metric and parallel transport governed by a non-metric and torsionful connection. We find that in such a theory simultaneously-emitted massless particles do not reach simultaneously a distant detector, as expected in light of the findings of arXiv:1103.5626 on the implications of non-metric connections. We also show that the theory admits a free-particle limit, where the relative-locality results of arXiv:1102.4637 are reproduced. We establish that the torsion of the $κ$-Poincaré connection introduces a small (but observably-large) dependence of the time of detection, for simultaneously-emitted particles, on some properties of the interactions producing the particles at the source.
description: 45 pages, 10 figures
Προσλήψεις του χορού στα ταξιδιωτικά κείμενα του 18ου αι.
Creators: name: Χαρμαντά, Αναστασία
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
The LHCb Upgrade
Creators: name: Collins, Paula
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The LHCb detector at the LHC has shown a very successful initial operation and it is expected that the experiment will accumulate an integrated luminosity in proton-proton collisions of around 1 fb-1 in 2011. The data already collected are being used to pursue the experiment's primary physics goal that is the search for New Physics via the measurement of CP asymmetries and rare decays in the b and c sector. The LHC is already capable of delivering higher luminosity than is currently used at LHCb, and an LHCb upgrade is planned for 2018 which will allow the detector to exploit higher luminosity running, and at the same time to enhance the trigger efficiencies, particularly in the hadronic decay modes. This upgrade will allow the experiment to accumulate an integrated luminosity of more than 50 fb-1 over the following decade, and acquire enormous samples of b and c hadron decays to allow for more precise measurements and a deeper exploration of the flavour sector. In addition, the flexibility of the new proposed trigger together with the unique angular coverage of the LHCb experiment opens up possibilities for interesting discoveries beyond the flavour sector, and will allow LHCb to focus on the physics channels which will be of most interest in the light of the discoveries of the coming decade.
description: Proceedings of FPCP 2011
Circle of dirt
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: non-verbal stimuli
subject: Hygiène
subject: Circle of dirt
subject: Stimuli
subject: Narration

description: Elan annotation file for the audio file with the same name. Double checked with Zhuma
Far Infrared Luminosity Function of Local Galaxies in the AKARI Deep Field South
Creators: name: Sedgwick, Chris
name: Serjeant, Stephen
name: Pearson, Chris
name: Matsuura, Shuji
name: Shirahata, Mai
name: Oyabu, Shinki
name: Goto, Tomotsugu
name: Matsuhara, Hideo
name: Clements, D. L.
name: Negrello, Mattia
name: Takagi, Toshinobu
name: White, Glenn J
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the first far-infrared luminosity function in the AKARI Deep Field South, a premier deep field of the AKARI Space Telescope, using spectroscopic redshifts obtained with AAOmega. To date, we have found spectroscopic redshifts for 389 galaxies in this field and have measured the local (z < 0.25) 90 micron luminosity function using about one-third of these redshifts. The results are in reasonable agreement with recent theoretical predictions.
description: 3 pages; poster at IAU Symposium No. 284, 2011
Potala palace 1
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: traditional story
subject: Gesar
subject: Potala palace
subject: Narration

description: Elan annotation file for the audio file with the same name. Double checked with Zhuma
«Διασπορικές κοινότητες» / «τόποι εν κινήσει»
Creators: name: Σπύρος, Θοδωρής
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
Μέσα μαζικής επικοινωνίας και χουλιγκανισμός
Creators: name: Νικολαϊδης, Αριστοτέλης
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
Reversible switching of room temperature ferromagnetism in CeO2-Co nanoparticles
Creators: name: Sacanell, J.
name: Paulin, M. A.
name: Ferrari, V.
name: Garbarino, G.
name: Leyva, A. G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigated the reversible ferromagnetic (FM) behavior of pure and Co doped CeO2 nanopowders. The as-sintered samples displayed an increasing paramagnetic contribution upon Co doping. Room temperature FM is obtained simply by performing thermal treatments in vacuum at temperatures as low as 500^{\circ}C and it can be switched off by performing thermal treatments in oxidizing conditions. The FM contribution is enhanced as we increase the time of the thermal treatment in vacuum. Those systematic experiments establish a direct relation between ferromagnetism and oxygen vacancies and open a path for developing materials with tailored properties.
description: 20 pages, 3 figures; Applied Physics Letters Vol. 100, Issue 17, APR2012
Πέρα από την κοινωνιολογία της γνώσης
Creators: name: Μαυρίδης, Ηρακλής
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
Potala palace 2
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: traditional story
subject: Gesar
subject: Potala palace
subject: Narration

description: Elan annotation file for the audio file with the same name. Double checked with Zhuma
History, poetry and “ethical materialism”
Creators: name: Seed, John
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
Willow
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: traditional story
subject: willow
subject: Religion
subject: evil spirit
subject: Bouddhisme
subject: Bodhisattva
subject: Narration

description: Elan annotation file for the audio file with the same name. Transcribed and translated with Zhuma
Reentrant topological phases in Mn-doped HgTe quantum wells
Creators: name: Beugeling, W.
name: Liu, C. X.
name: Novik, E. G.
name: Molenkamp, L. W.
name: Smith, C. Morais
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum wells of HgTe doped with Mn display the quantum anomalous Hall effect due to the magnetic moments of the Mn ions. In the presence of a magnetic field, these magnetic moments induce an effective nonlinear Zeeman effect, causing a nonmonotonic bending of the Landau levels. As a consequence, the quantized (spin) Hall conductivity exhibits a reentrant behavior as one increases the magnetic field. Here, we will discuss the appearance of different types of reentrant behavior as a function of Mn concentration, well thickness, and temperature, based on the qualitative form of the Landau-level spectrum in an effective four-band model.
description: 8 pages, 3 figures
Για το δημόσιο χρέος
Creators: name: Λαπατσιώρας, Σπύρος
name: Σωτηρόπουλος, Δημήτρης Π.
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
Περιεχόμενα
Creators: name: Περιεχόμενα, Περιεχόμενα
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 19-20 (2016)
Three little pigs
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Animaux
subject: three little pigs and a wolf
subject: Stimuli
subject: Narration

description: Elan annotation file for the audio file with the same name. Transcribed and double checked with Zhuma
Hawking temperature of rotating charged black strings from tunneling
Creators: name: Ahmed, Jamil
name: Saifullah, K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Thermal radiations from spherically symmetric black holes have been studied from the point of view of quantum tunneling. In this paper we extend this approach to study radiation of fermions from charged and rotating black strings. Using WKB approximation and Hamilton-Jacobi method we work out the tunneling probabilities of incoming and outgoing fermions and find the correct Hawking temperature for these objects. We show that in appropriate limits the results reduce to those for the uncharged and non-rotating black strings.
Thirsty crow
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Animaux
subject: Oiseaux
subject: thirsty crow
subject: Stimuli
subject: Narration

description: Elan annotation file for the audio file with the same name. Transcribed and double checked with Zhuma
Why are central radio relics so rare?
Creators: name: Vazza, F.
name: Brueggen, M.
name: van Weeren, R.
name: Bonafede, A.
name: Dolag, K.
name: Brunetti, G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In this paper we address the question why cluster radio relics that are connected to shock acceleration, so-called radio gischt, have preferentially been found in the outskirts of galaxy clusters. By identifying merger shock waves in cosmological grid simulations, we explore several prescriptions for relating the energy dissipated in shocks to the energy emitted in the radio band. None of the investigated models produce detectable radio relics within 100-200 kpc from the cluster centre. All models cause > 50 per cent of the detectable relic emission at projected distances > 800 kpc. Central radio relics caused by shocks that propagate along the line-of-sight are rare events for simple geometrical reasons, and they have a low surface brightness making them elusive for current instruments. Our simulations show that the radial distribution of observed relics can be explained by the radial trend of dissipated kinetic energy in shocks, that increases with distance from the cluster centre up until half of the virial radius.
description: 6 pages, 4 figures. MNRAS accepted
Οδηγίες
Creators: name: Οδηγίες, Οδηγίες
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 17-18 (2013)
Σημειώματα
Creators: name: Ζάζας, Δημήτρης
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 17-18 (2013)
ΕΔΑ και το ΚΚΕ εσωτερικού απέναντι στην ευρωπαϊκή ολοκλήρωση
Creators: name: Λαμπρινού, Κατερίνα
name: Μπαλαμπανίδης, Γιάννης
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 17-18 (2013)
Monkeys and the moon
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Animaux
subject: Astronomie
subject: monkeys and the moon
subject: Stimuli
subject: Narration

description: Elan annotation file for the audio file with the same name. Transcribed and double checked with Zhuma
Stability of Closed Timelike Curves in a Galileon Model
Creators: name: Evslin, Jarah
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently Burrage, de Rham, Heisenberg and Tolley have constructed eternal, classical solutions with closed timelike curves (CTCs) in a Galileon model coupled to an auxiliary scalar field. These theories contain at least two distinct metrics and, in configurations with CTCs, two distinct notions of locality. As usual, globally CTCs lead to pathologies including nonlocal constraints on the initial Cauchy data. Locally, with respect to the gravitational metric, we use a WKB approximation to explicitly construct small, short-wavelength perturbations without imposing the nonlocal constraints and observe that these perturbations do not grow and so do not lead to an instability.
description: 10 pages, no figures
Coincidence Problem and Holographic $f(R)$ Gravity in Spatially flat and Curved Universes
Creators: name: Bisabr, Yousef
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The $f(R)$ gravity models formulated in Einstein conformal frame are equivalent to Einstein gravity together with a minimally coupled scalar field. The scalar field couples with the matter sector and the coupling term is given by the conformal factor. We apply the holographic principle to such an interacting model in spatially flat and curved universes. We show that the model leads to a constant ratio of energy densities of dark matter to dark energy in a spatially flat universe. In a spatially curved universe, the ratio is not a constant and the evolution seems to be model-dependent. However, we argue that any cosmologically viable $f(R)$ model can lead to a nearly constant ratio of energy densities and therefore alleviate the coincidence problem.
description: 9 pages, To appear in Gravitation and Cosmology
Traditional Xumi bowls and kettles
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Cuisine
subject: Objets usuels
subject: household utensils
subject: bowl
subject: kettle
subject: pot
subject: wooden box
subject: Explanation

description: Elan annotation file for the audio file with the same name. Translated and verified with Zhuma in June 2016
Λακού-Λαμπάρτ και η λακανική αισθ-ηθική
Creators: name: Παπαχριστόπουλος, Νίκος
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 17-18 (2013)
The Age-Metallicity Relation in the Thin Disk of the Galaxy
Creators: name: Marsakov, V. A.
name: Koval', V. V.
name: Borkova, T. V.
name: Shapovalov, M. V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: HST trigonometric distances, photometric metallicities, isochronic ages from the second revised version of the Geneva--Copenhagen survey, and uniform spectroscopic Fe and Mg abundances from our master catalog are used to construct and analyze the age--metallicity and age-relative Mg abundance relations for stars of the thin disk. The influences of selection effects are discussed in detail. It is demonstrated that the radial migration of stars does not lead to appreciable distortions in the age dependence of the metallicity. During the first several billion years of the formation of the thin disk, the interstellar material in this disk was, on average, fairly rich in heavy elements ( ~-0.2) and poorly mixed. However, the metallicity dispersion continuously decreased with age, from σ_{[Fe/H]}~0.22 to ~0.13. All this time, the mean relative abundance of Mg was somewhat higher than the solar value (~0.1). Roughly four to five billion years ago, the mean metallicity began to systematically increase, while retaining the same dispersion; the mean relative Mg abundance began to decrease immediately following this. The number of stars in this subsystem increased sharply at the same time. These properties suggest that the star-formation rate was low in the initial stage of formation of the thin disk, but abruptly increased about four to five billion years ago.
description: 16 page, 7 figures, accepted 2011, Astron. Rep., v.55, No.8, p.667-682
Wittgenstein και το πρόβλημα του πολιτισμικού σχετικισμού
Creators: name: Γιαννοπούλου, Αρχοντούλα
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 17-18 (2013)
Traditional Xumi butter tea churns and jugs
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Cuisine
subject: Objets usuels
subject: household utensils
subject: bowls
subject: Meubles
subject: table
subject: types of wood
subject: churn
subject: Explanation

description: Elan annotation file for the audio/video files with the same name. Translated and verified with Zhuma in June 2016
Elastic precession of electronic spin states in interacting integer quantum Hall edge channels
Creators: name: Venturelli, Davide
name: Feinberg, Denis
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider the effect of Coulomb interactions in the propagation of electrons, prepared in arbitrary spin states, on chiral edge channels in the integer quantum Hall regime. Electrons are injected and detected at the same energy at different locations of the Hall bar, which is modeled as a chiral Tomonaga-Luttinger liquid. The current is computed perturbatively in the tunneling amplitudes, within a non-crossing approximation using exact solutions of the interacting Green's functions. In the case of different channel velocities, the spin precession effect is evaluated, and the role of interaction parameters and wavevectors is discussed.
description: 5 pages, 3 figures
Εναλλακτικοί γκουρού νέας εποχής
Creators: name: Ανδριάκαινα, Ελένη
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 17-18 (2013)
μήνυμα της (μη) ψήφου
Creators: name: Αλβανός, Ραϋμόνδος
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 17-18 (2013)
Traditional Xumi tea and wine vessels
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Ustensiles de cuisine
subject: Cuisine
subject: Objets usuels
subject: kettle
subject: box
subject: Explanation

description: Elan annotation file for the audio/video files with the same name. Translated and verified with Zhuma in June 2016
Εικόνες της «Ελλάδας» και της «Τουρκίας» μέσα από τον καθρέφτη του ευρωπαϊκού τύπου
Creators: name: Παπαθέου, Κατερίνα
Publisher: name: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies
Year: 2020

description: δοκιμές, Επιθεώρηση Κοινωνικών Σπουδών // dokimes, Review of Social Studies, No. 17-18 (2013)
Traditional Xumi incense bowl
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: incense pot
subject: Explanation

description: Elan annotation file for the audio/video files with the same name. Translated and verified with Zhuma in June 2016
Experimental isotope shifts of the 5 $^2S_{1/2}$ state and low-lying excited states of Rb
Creators: name: Aldridge, L.
name: Gould, P. L.
name: Eyler, E. E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: By combining a recent precise measurement of the ionization energy of $^{87}$Rb with previous measurements of electronic and hyperfine structure, an accurate value for the $^{85}\textrm{Rb}-^{87}\textrm{Rb}$ isotope shift of the 5$^2S_{1/2}$ ground state can be determined. In turn, comparison with additional spectroscopic data makes it possible for the first time to evaluate isotope shifts for the low-lying excited states, accurate in most cases to about 1 MHz. In a few cases, the specific mass shift contribution can be determined in addition to the total shift. This information is particularly useful for spectroscopic analysis of transitions to Rydberg states, and for tests of atomic theory.
description: 3 pages, 1 table
Traditional Xumi male clothing
Creators: name: Chirkova, Katia
Publisher: name: Pangloss
Year: 2018
Subjects: subject: Linguistique
subject: Xumi
subject: Chinese, Mandarin
subject: Vêtements
subject: traditional clothes for men
subject: shoes
subject: Explanation

description: Elan annotation file for the audio/video files with the same name. Translated and verified with Zhuma in June 2016
Electrically Controlled Pumping of Spin Currents in Topological Insulators
Creators: name: Citro, R.
name: Romeo, F.
name: Andrei, N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Pure spin currents are shown to be generated by an electrically controlled quantum pump applied at the edges of a topological insulator. The electric rather than the more conventional magnetic control offers several advantages and avoids, in particular, the necessity of delicate control of magnetization dynamics over tiny regions. The pump is implemented by pinching the sample at two quantum point contacts and phase modulating two external gate voltages between them. The spin current is generated for the full range of parameters. On the other hand, pumping via amplitude modulation of the inter-boundary couplings generates both charge and spin currents, with a pure charge current appearing only for special values of the parameters for which the Bohm-Aharonov flux takes integer values. Our setup can therefore serve to fingerprint the helical nature of the edges states with the zeros of the pumped spin and charge currents occurring at distinct universal locations where the Fabry-Perot or the Aharonov-Bohm phases take integer values.
description: 5 pages, 5figures