cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Geometric structure of multi-form-field isotropic inflation and primordial fluctuations
Creators: name: Chen, Chong-Bin
name: Soda, Jiro
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: An inflationary scenario is expected to be embedded into an ultraviolet (UV) complete theory such as string theory. The effect of UV complete theories may appear as nontrivial kinetic terms in the low energy effective field theory, which provides a nontrivial geometry in field space. In this paper, we study the effect of the geometry of multi-form-field space on an inflationary scenario. In particular, we focus on the geometric destabilization mechanism which induces the phase transition from the conventional slow-roll inflation to a novel inflationary scenario. Anisotropic inflation is a typical example of the new phase. To conform to observations, we restrict us to isotropic configuration of form fields. We clarify the conditions for the onset of the destabilization and reveal the geometric structure of attractors after the destabilization. We classify the viable models from the observational point of view. We also investigate the features of the primordial fluctuations and find the similarity to hyperbolic inflation. By calculating the power spectrum, we make several phenomenological predictions which are useful to discriminate our models from others inflation models. We found the scalar-to-tensor $r$ will be suppressed by large one-form gauge fields, while it has the same order as the slow roll parameter $r\sim\mathcal{O}(1)ε$ for large two-from gauge fields.
description: 46 pages, 10 figures, 3 tables; Pubication version
Il lavoro subordinato flessibile nel settore privato e nel pubblico impiego tra regole comunitarie e disciplina nazionale. Tendenze evolutive in un mondo flessibile
Creators: name: Prisco, Valentina
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2015

description: Il lavoro di tesi mira alla definizione delle principali tipologie contrattuali del lavoro subordinato flessibile nel contesto di una società post-industriale, attraverso la ricostruzione dell'evoluzione normativa e giurisprudenziale, italiana ed europea, che ha interessato sia il settore privato che il pubblico impiego dal secondo dopoguerra ad oggi. Il riferimento è, da una parte, al lavoro a termine, ai lavori con finalità formative, all'apprendistato, e al part-time; dall'altra, ci si riferisce alle figure di lavoro atipico, quali, in particolare, il lavoro a chiamata, in somministrazione, ripartito; tralasciando, per esigenze di sinteticità, l'ambito del lavoro autonomo ed occasionale.
Particolare attenzione viene riservata all'analisi delle conseguenze della violazione delle norme sul lavoro subordinato flessibile, attraverso lo studio e l'approfondimento delle principali differenze che intercorrono tra il settore privato e il pubblico impiego, nel cui ambito si riscontra l'assenza di una vera e propria capacità dissuasiva del sistema sanzionatorio, con inevitabili e incerte conseguenze sulle procedure di stabilizzazione del precariato pubblico.
L'ultima parte della ricerca verte sulla riflessione circa gli esiti ambigui della flessibilità in entrata in Italia e sulle ragioni che portano alla precarietà, anche attraverso l'approfondimento delle proposte di riforma che si stanno analizzando a livello nazionale e nel contesto europeo, alla ricerca del delicato punto di equilibrio tra flessibilità e sicurezza. Particolare attenzione viene dedicata alla recente riforma del lavoro in Italia, il c.d. Jobs Act (l. n. 183/2014).
La tesi propende per la necessità di assicurare una riscrittura del diritto del lavoro, più selettivo nelle priorità e meno protettivo, che sia in grado di intrecciarsi con le politiche sociali e di ricollegarsi alle istituzioni del mercato del lavoro, nonché viene sottolineata l'esigenza di un passaggio sul piano nazionale dal welfare dell'assistenza ad un welfare delle responsabilità e delle opportunità, che non lasci soli gli individui con la copertura di qualche sussidio, ma mettendo loro a disposizione interventi diversificati di crescita del sapere; un sistema, dunque, che sia in grado di stimolare la responsabilità individuale e scoraggiare la rassegnazione.
Inoltre, si mette in rilievo la necessità, sul piano europeo, della definizione di un nuovo welfare paneuropeo per una cittadinanza sociale attiva, attraverso il ripensamento degli strumenti di regolazione sociale che consentano di ridefinire i parametri dell'uguaglianza sociale, di amplificare e garantire l'accesso alle opportunità, di assicurare sostegni materiali e immateriali che evitino l'esclusione sociale, di combattere il lavoro illegale e di trasformare quello precario in un'occasione positiva.
GOVERNANCE ECONOMICA DELL'UNIONE EUROPEA
Creators: name: Caputo, Marianna
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2015

description: Con la locuzione Governance economica dell'Unione europea si intende riferirsi all'attuale assetto di poteri in materia di Politica economica diviso tra Stati membri e Unione europea. Ci riferiamo, altresì, alla disciplina adottata dagli Stati membri e dalle istituzioni dell'Unione che regola l'attribuzione delle competenze in materia, nonché le loro modalità di esercizio. Tali fonti hanno diversa natura: internazionale, dell'Unione e nazionale.
Per Politica economica si intende la disciplina che studia gli effetti dell'intervento dei poteri pubblici (Stato, Banca centrale, ed altre autorità) e dei soggetti privati (imprese, famiglie,...) sull'economia, allo scopo di elaborare interventi destinati a modificare l'andamento del sistema economico a livello macroeconomico per raggiungere obiettivi prefissati. Alla luce di questa considerazione, lo studio sulla Governance economica dell'Unione europea, oggetto della nostra indagine, deve necessariamente aprirsi con l'analisi delle teorie economiche che hanno informato le scelte istituzionali, in particolare dell'Unione, e degli strumenti di politica economica ad oggi ancora in possesso degli Stati membri e di quelli ormai attribuiti alle Istituzioni europee. In tale contesto, chi scrive si è avvalso di nozioni, concetti appartenenti alla Scienza economica, strumentali alle riflessioni di carattere giuridico e istituzionale che costituiscono il principale oggetto di studio del presente lavoro.
A ben vedere la cessione di sovranità nei confronti dell'Unione non riguarda la sola politica monetaria, ma anche ulteriori strumenti di politica economica. Tale circostanza porterebbe a ritenere, almeno prima facie, che i margini di manovra dei governi nazionali nella predisposizione delle proprie politiche ne escano sensibilmente ridotti, sebbene una riflessione approfondita, come vedremo, conduce ad una valutazione almeno più bilanciata riguardo l'apprezzamento delle ultime riforme.
Una volta analizzato in dettaglio ognuno di tali strumenti e rilevato lo stato dell'arte, anche alla luce della portata da riconoscere alla regola d'oro, inserita in Costituzione, del pareggio in bilancio, si passerà ad analizzare le prospettive della "comunitarizzazione" del Trattato sulla Stabilità, sul Coordinamento e sulla Governance nell'Unione Economica e Monetaria, prevista all'art. 16 del Trattato stesso. Sarà preso in considerazione l'impatto della comunitarizzazione sul funzionamento del sistema dei rapporti tra Europa e Stati membri, riservando una particolare attenzione alle conseguenze che da essa potrebbero derivare sulla qualificazione e sullo sviluppo del processo di integrazione europeo. Ciò anche alla luce delle recenti novelle legislative in materia di Unione bancaria, al cui studio sarà dedicata un'apposita sezione all'interno del lavoro.
Full counting statistics of 1d short-range Riesz gases in confinement
Creators: name: Kethepalli, Jitendra
name: Kulkarni, Manas
name: Kundu, Anupam
name: Majumdar, Satya N.
name: Mukamel, David
name: Schehr, Grégory
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We investigate the full counting statistics (FCS) of a harmonically confined 1d short-range Riesz gas consisting of $N$ particles in equilibrium at finite temperature. The particles interact with each other through a repulsive power-law interaction with an exponent $k>1$ which includes the Calogero-Moser model for $k=2$. We examine the probability distribution of the number of particles in a finite domain $[-W, W]$ called number distribution, denoted by $\mathcal{N}(W, N)$. We analyze the probability distribution of $\mathcal{N}(W, N)$ and show that it exhibits a large deviation form for large $N$ characterised by a speed $N^{\frac{3k+2}{k+2}}$ and by a large deviation function of the fraction $c = \mathcal{N}(W, N)/N$ of the particles inside the domain and $W$. We show that the density profiles that create the large deviations display interesting shape transitions as one varies $c$ and $W$. This is manifested by a third-order phase transition exhibited by the large deviation function that has discontinuous third derivatives. Monte-Carlo (MC) simulations show good agreement with our analytical expressions for the corresponding density profiles. We find that the typical fluctuations of $\mathcal{N}(W, N)$, obtained from our field theoretic calculations are Gaussian distributed with a variance that scales as $N^{ν_k}$, with $ν_k = (2-k)/(2+k)$. We also present some numerical findings on the mean and the variance. Furthermore, we adapt our formalism to study the index distribution (where the domain is semi-infinite $(-\infty, W])$, linear statistics (the variance), thermodynamic pressure and bulk modulus.
description: 36 pages, 7 figures
Next-to-tribimaximal mixing against CP violation and baryon asymmetry signs
Creators: name: Li, Shao-Ping
name: Yuan-Yuan-Li
name: Yan, Xin-Shuai
name: Zhang, Xin
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Four next-to-tribimaximal (NTBM) mixing patterns are widely considered as the feasible candidates for the observed leptonic mixing structure. With the recent measurements from T2K, as well as intensive global fits, the interval of $\sinδ_{ CP} > 0$ for the Dirac CP-violating phase is persistently small in the normal ordering while $\sinδ_{ CP} < 0$ is successively obtained up to $3σ$ level in the inverted ordering. In this paper, we advocate the fitting results of Dirac CP-violating phase as a constraint, and show that, it can basically rule out half of the regions allowed by the constraint from three mixing angles only. In addition, given the small $\sinδ_{ CP} > 0$ interval, we find that a unique NTBM pattern can be selected out of the four candidates within $3σ$ uncertainty of the latest NuFIT 5.1, when the patterns are exposed to a Yukawa texture-independent leptogenesis for the baryon asymmetry of the Universe. For the surviving pattern, we find an interesting correlation between the Dirac CP-violating phase and the octant of atmospheric angle $θ_{23}$ , where $θ_{23}>45^\circ$ can be predicted once $5π/6 < δ_{CP}
description: 8 pages, 4 figures, Published version in PRD
Robustness of type-II Dirac cones in biphenylene-based structures
Creators: name: Lage, L. L.
name: Arroyo-Gascón, O.
name: Chico, Leonor
name: Latgé, A.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electronic properties of one- and two-dimensional biphenylene-based systems, such as nanoribbons and bilayers, are studied within a unified approach. Besides the bilayer with direct (AA) stacking, we present two additional symmetric stackings for bilayer biphenylene that we denote by AB, by analogy with bilayer graphene, and AX, which can be derived by a small translation (slip) from the AA bilayer, with distinct band structures. We combine first-principles calculations with a tight-binding model to provide a realistic effective description of these structures. Our approach provides a global framework to characterize and analyze the robustness of the type-II Dirac cone within these structures, captures the variations caused by different stackings, and highlights important symmetries inherent in the biphenylene nanoribbon Dirac cones and edge states.
Non-invertible symmetries act locally by quantum operations
Creators: name: Okada, Masaki
name: Tachikawa, Yuji
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-invertible symmetries of quantum field theories and many-body systems generalize the concept of symmetries by allowing non-invertible operations in addition to more ordinary invertible ones described by groups. The aim of this paper is to point out that these non-invertible symmetries act on local operators by quantum operations, i.e. completely positive maps between density matrices, which form a natural class of operations containing both unitary evolutions and measurements and play an important role in quantum information theory. This observation will be illustrated by the Kramers--Wannier duality of the one-dimensional quantum Ising chain, which is a prototypical example of non-invertible symmetry operations.
description: 5+2 pages; v2: published version, with newly added supplementary materials
Dolichogenidea leahdennisae Fernandez-Triana & Boudreault 2025, sp. nov.
Creators: name: Fernandez-Triana, Jose L.
name: Boudreault, Caroline
name: Whitfield, James B.
name: Höcherl, Amelie
name: Smith, M. Alex
name: Hallwachs, Winnifred
name: Janzen, Daniel H.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea leahdennisae

description: Dolichogenidea leahdennisae Fernandez-Triana & Boudreault sp. nov.
Fig. 86 A – H
Type material.
Holotype. Costa Rica • Female, CNC; Alajuela, Area de Conservación Guanacaste, Sector San Cristobal, Bosque Trampa Malaise; 10.8628, -85.3846; 815 m; 10.vi.2007; D. H. Janzen & W. Hallwachs leg.; Malaise trap; Voucher code: DHJPAR 0026079.
Diagnostic description.
T 1 parallel-sided or mostly parallel-sided, its length medially <3.0 × its width at posterior margin; T 2 mostly smooth but with some sculpture along posterior margin; T 2 comparatively more transverse, its length medially 4.0–5.0 × its width at posterior margin; tegula and humeral complex dark brown; legs mostly pale (yellow), except for metacoxa with anterior 0.3 brown; body length: 2.80 mm; fore wing length: 3.00 mm. Among all species with smooth T 2 and pale pro- and mesocoxae, D. leahdennisae can be distinguished by its T 1 and T 2 shape, T 2 sculpture, color of tegula and humeral complex, and body size.
Distribution.
Costa Rica.
Biology.
No host data available.
DNA barcoding data.
BIN BOLD: AAJ 1396 (2 sequences, 2 barcode compliant).
Etymology.
Named after Leah Dennis in recognition of her many years of administrating the Biology Department office housing DHJ and WH at the University of Pennsylvania.
description: Published as part of Fernandez-Triana, Jose L., Boudreault, Caroline, Whitfield, James B., Höcherl, Amelie, Smith, M. Alex, Hallwachs, Winnifred & Janzen, Daniel H., 2025, A revision of the parasitoid wasp genus Dolichogenidea Viereck (Hymenoptera, Braconidae) in the Neotropical region, with the description of 102 new species, pp. 1-250 in ZooKeys 1237 on pages 1-250, DOI: 10.3897/zookeys.1237.141007
INTEGRATING MACHINE LEARNING WITH IOT FOR ENHANCED SOCIAL SERVICES DELIVERY AND INNOVATIONS IN COMMUNITY PRACTICE
Creators: name: Mohideen AbdulKader M
name: Varsha D. Jadhav
name: D. Karunkuzhali
name: Kotigari Reddi Swaroop
Publisher: name: Zenodo
Year: 2024
Subjects: Machine Learning, Waste Management, Predictive Analytics, Urban Sustainability, Data-Driven Decision-Making.

description: Abstract

In the present work this study looks into combine machine learning and Internet of Things (IoT) technologies to improve waste management in urban areas. The study collects real-time data on waste levels, temperature and fire hazard in smart bins deployed using IoT sensors. To optimize the waste collections paths, machine learning models like Support Vector Machine (SVM), Artificial Neural Network (ANN), Decision Tree (DT) and Recurrent Neural Networks (RNN) were trained and tested to predict the quantities of the garbage. Results showed that the accuracy of SVM model was 98.86% and ANN was 95.60%, DT was 93.45% and RNN achieved only 91.20%. By combining IoT with machine learning, it streamlines waste collection process and improve the overall cost of operations as well as decrease the environmental impact through predicting analytics-based optimization such as routes, schedules etc. While the study notes some of the adversities such as data quality, infrastructure costs or privacy concerns that AI and IoT has to endure when implemented in Human populated ecosystem, it also reiterates the immense potential these technologies have to benefit urban waste management. In other words, data-driven insights could also help cities to reduce the operational expenses and can allocate resources in more sustainable manners. The knowledge provided by this research helps pave the way for more intelligent and better waste management cities of the future that are ultimately cleaner and healthier.
Calliope: Pseudospectral shearing magnetohydrodynamics code with a pencil decomposition
Creators: name: Kawazura, Y.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The pseudospectral method is a highly accurate numerical scheme suitable for turbulence simulations. We have developed an open-source pseudospectral code, \textsc{\textsf{Calliope}}, which adopts the P3DFFT library \citep{Pekurovsky2012} to perform a fast Fourier transform with the two-dimensional (pencil) decomposition of numerical grids. \textsc{\textsf{Calliope}} can solve incompressible magnetohydrodynamics (MHD), isothermal compressible MHD, and rotational reduced MHD with parallel computation using very large numbers of cores ($> 10^5$ cores for $2048^3$ grids). The code can also solve for local magnetorotational turbulence in a shearing frame using the remapping method \citep{Rogallo1981,Umurhan2004}. \textsc{\textsf{Calliope}} is currently the only pseudospectral code that can compute magnetorotational turbulence using pencil-domain decomposition. This paper presents the numerical scheme of \textsc{\textsf{Calliope}} and the results of linear and nonlinear numerical tests, including compressible local magnetorotational turbulence with the largest grid number reported to date.
description: Accepted for publication in The Astrophysical Journal
Restriction-induced time-dependent transcytolemmal water exchange: Revisiting the Kärger exchange model
Creators: name: Shi, Diwei
name: Liu, Fan
name: Li, Sisi
name: Chen, Li
name: Jiang, Xiaoyu
name: Gore, John C.
name: Zheng, Quanshui
name: Guo, Hua
name: Xu, Junzhong
Publisher: name: arXiv
Year: 2024
Subjects: subject: Medical Physics (physics.med-ph)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: The Kärger model and its derivatives have been widely used to incorporate transcytolemmal water exchange rate, an essential characteristic of living cells, into analyses of diffusion MRI (dMRI) signals from tissues. The Kärger model consists of two homogeneous exchanging components coupled by an exchange rate constant and assumes measurements are made with sufficiently long diffusion time and slow water exchange. Despite successful applications, it remains unclear whether these assumptions are generally valid for practical dMRI sequences and biological tissues. In particular, barrier-induced restrictions to diffusion produce inhomogeneous magnetization distributions in relatively large-sized compartments such as cancer cells, violating the above assumptions. The effects of this inhomogeneity are usually overlooked. We performed computer simulations to quantify how restriction effects, which in images produce edge enhancements at compartment boundaries, influence different variants of the Kärger-model. The results show that the edge enhancement effect will produce larger, time-dependent estimates of exchange rates in e.g., tumors with relatively large cell sizes (>10 μm), resulting in overestimations of water exchange as previously reported. Moreover, stronger diffusion gradients, longer diffusion gradient durations, and larger cell sizes, all cause more pronounced edge enhancement effects. This helps us to better understand the feasibility of the Kärger model in estimating water exchange in different tissue types and provides useful guidance on signal acquisition methods that may mitigate the edge enhancement effect. This work also indicates the need to correct the overestimated transcytolemmal water exchange rates obtained assuming the Kärger-model.
description: 37 pages, 8 figures
Accelerated adiabatic passage in cavity magnomechanics
Creators: name: Qi, Shi-fan
name: Jing, Jun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Cavity magnomechanics provides a readily-controllable hybrid system, that consisted of cavity mode, magnon mode, and phonon mode, for quantum state manipulation. To implement a fast-and-robust state transfer between the hybrid photon-magnon mode and the phonon mode, we propose two accelerated adiabatic-passage protocols individually based on the counterdiabatic Hamiltonian for transitionless quantum driving and the Levis-Riesenfeld invariant for inverse engineering. Both the counterdiabatic Hamiltonian and the Levis-Riesenfeld invariant generally apply to the continuous-variable systems with arbitrary target states. It is interesting to find that our counterdiabatic Hamiltonian can be constructed in terms of the creation and annihilation operators rather than the system-eigenstates and their time-derivatives. Our protocol can be optimized with respect to the stability against the systematic errors of coupling strength and frequency detuning. It contributes to a quantum memory for photonic and magnonic quantum information. We also discuss the effects from dissipation and the counter-rotating interactions.
Quasinormal ringing of general spherically symmetric parametrized black holes
Creators: name: Konoplya, R. A.
name: Zhidenko, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The general parametrization of spherically symmetric and asymptotically flat black-hole spacetimes in arbitrary metric theories of gravity was suggested in [3]. The parametrization is based on the continued fraction expansion in terms of the compact radial coordinate and has superior convergence and strict hierarchy of parameters. It is known that some observable quantities, related to particle motion around the black hole, such as the eikonal quasinormal modes, radius of the shadow, frequency at the innermost stable circular orbit, and others, depend mostly on only a few of the lowest coefficients of the parametrization. Here we continue this approach by studying the dominant (low-lying) quasinormal modes for such generally parametrized black holes. We show that, due to the hierarchy of parameters, the dominant quasinormal frequencies are also well determined by only the first few coefficients of the expansion for the so-called moderate black-hole geometries. The latter are characterized by a relatively slow change of the metric functions in the radiation zone near the black hole. The nonmoderate metrics, which change strongly between the event horizon and the innermost stable circular orbit are usually characterized by echoes or by the distinctive (from the Einstein case) quasinormal ringing which does not match the current observational data. Therefore, the compact description of a black-hole spacetime in terms of the truncated general parametrization is an effective formalism for testing strong gravity and imposing constraints on allowed black-hole geometries.
description: 10 pages, 9 figures
Dolichogenidea limoncocha Fernandez-Triana & Boudreault 2025, sp. nov.
Creators: name: Fernandez-Triana, Jose L.
name: Boudreault, Caroline
name: Whitfield, James B.
name: Höcherl, Amelie
name: Smith, M. Alex
name: Hallwachs, Winnifred
name: Janzen, Daniel H.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea limoncocha

description: Dolichogenidea limoncocha Fernandez-Triana & Boudreault sp. nov.
Fig. 87 A – F
Type material.
Holotype. Ecuador • Female, CNC; Napo, Limoncocha; 250 m; 15–28.vi.1976; S & J Peck leg.; CNC 1179901.
Diagnostic description.
Fore wing veins r and 2 RS strongly angulate; T 1 strongly sculptured; T 1 more or less parallel-sided, only very slightly narrowing near posterior margin,> 2.5 × as long as wide at posterior margin; T 2 trapezoidal and mostly smooth; tegula and humeral complex yellow; all coxae yellow-white; metafemur mostly yellow-white with only posterior 0.1 brown; comparatively paler colored metasoma, with most laterotergites and all sternites and hypopygium yellow-white, T 1 dark brown, T 2 pale yellow-brown, and T 3 (entirely), T 4 (mostly), and T 5 (partially, centrally) yellow to yellow-white; body length: 2.78 mm; fore wing length: 2.73 mm. A very distinctive species based on its rather unique pale color of metasoma (especially T 4 and T 5), pale colored legs, and T 1 more or less parallel-sided.
Distribution.
Ecuador.
Biology.
No host data available.
DNA barcoding data.
No data.
Etymology.
Named after the type locality.
description: Published as part of Fernandez-Triana, Jose L., Boudreault, Caroline, Whitfield, James B., Höcherl, Amelie, Smith, M. Alex, Hallwachs, Winnifred & Janzen, Daniel H., 2025, A revision of the parasitoid wasp genus Dolichogenidea Viereck (Hymenoptera, Braconidae) in the Neotropical region, with the description of 102 new species, pp. 1-250 in ZooKeys 1237 on pages 1-250, DOI: 10.3897/zookeys.1237.141007
Electrochemical characterisation of ionic dynamics resulting from spin conversion of water isomers
Creators: name: Kernbach, Serge
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Para- and ortho- isomers of water have different chemical and physical properties. Excitations by magnetic field, laser emission or hydrodynamic cavitation are reported to change energetic levels and spin configurations of water molecules that in turn change macroscopically measurable properties of aqueous solutions. Similar scheme is also explored for dissolved molecular oxygen, where physical excitations form singlet oxygen with different spin configurations and generate a long chain of ionic and free-radical reactions. This work utilizes electrochemical impedance spectroscopy (EIS) to characterize ionic dynamics of proposed spin conversion methods applied to dissolving of carbon dioxide CO$_2$ and hydrogen peroxide H$_2$O$_2$ in pure water excited by fluctuating weak magnetic field in uT range. Measurement results demonstrate different ionic reactivities and surface tension effects triggered by excitations at 10$^{-8}$J/mL. The CO$_2$- and O$_2$-related reaction pathways are well distinguishable by EIS. Control experiments without CO$_2$/H$_2$O$_2$ input show no significant effects. Dynamics of electrochemical impedances and temperature of fluids indicates anomalous quasi-periodical fluctuations pointing to possible carbonate-induced cyclic reactions or cyclical spin conversion processes. This approach can underlay development of affordable sensors operating with spin conversion technologies.
Stacking of charge-density waves in 2H-NbSe$_2$ bilayers
Creators: name: Cossu, Fabrizio
name: Nafday, Dhani
name: Palotás, Krisztian
name: Biderang, Mehdi
name: Kim, Heung-Sik
name: Akbari, Alireza
name: Di Marco, Igor
Publisher: name: arXiv
Year: 2024
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We employ ab-initio electronic structure calculations to investigate the charge-density waves and periodic lattice distortions in bilayer 2H-NbSe$_2$. We demonstrate that the vertical stacking can give rise to a variety of patterns that may lower the symmetry of the charge-density waves exhibited separately by the two composing 1H-NbSe$_2$ monolayers. The general tendency to a spontaneous symmetry breaking observed in the ground state and the first excited states is shown to originate from a non-negligible inter-layer coupling. Simulated images for scanning tunnelling microscopy (STM) as well as diffraction/scattering patterns show signatures of the different stacking orders. This may not only be useful to reinterpret past experiments on surfaces and thin films, but may also be exploited to devise ad-hoc experiments for the investigation of the stacking order in 2H-NbSe$_2$. We anticipate that our analysis does not only apply to the 2H-NbSe$_2$ bilayer, but is also relevant for thin films and bulk, whose smallest centro-symmetric component is indeed the bilayer. Finally, our results illustrate clearly that the vertical stacking is not only important for 1T structures, as exemplified by the metal-to-insulator transition observed in 1T-TaS$_2$, but seems to be a general feature of metallic layered transition metal dichalcogenides as well.
description: 15 pages, 9 figures
Dolichogenidea luishamiltoni Fernandez-Triana & Boudreault 2025, sp. nov.
Creators: name: Fernandez-Triana, Jose L.
name: Boudreault, Caroline
name: Whitfield, James B.
name: Höcherl, Amelie
name: Smith, M. Alex
name: Hallwachs, Winnifred
name: Janzen, Daniel H.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea luishamiltoni

description: Dolichogenidea luishamiltoni Fernandez-Triana & Boudreault sp. nov.
Fig. 88 A – G
Type material.
Holotype. Costa Rica • Female, CNC; Guanacaste, Area de Conservación Guanacaste, Sector San Cristobal, Bosque Transición; 10.86472, -85.41531; 540 m; 29.viii.2010; Gloria Sihezar leg.; Host: gelJanzen 01 Janzen 394; Voucher code: DHJPAR 0042017; Host voucher code: 10-SRNP-4850. Paratypes. Costa Rica • 3 Females, CNC; DHJPAR 0050116, DHJPAR 0050174, DHJPAR 0051148.
Diagnostic description.
Posterior 0.5–0.6 of T 1 mostly with strong sculpture, usually longitudinal striae; T 1 slightly broadening posteriorly; T 2 mostly smooth; T 2 comparatively very transverse but with anterior margin arcuate; ovipositor sheath clearly longer (1.15–1.25 ×) than metatibia length; tegula and humeral complex yellow; coxae dark brown to black; trochantelli dark brown to black; metafemur dark brown; metatibia dark brown on posterior 0.8; body length: 2.81–2.88 mm; fore wing length: 3.13–3.28 mm. Among species with smooth T 2 and metafemur dark, this species can be distinguished by T 1 shape, ovipositor sheath length, and tegula, humeral complex and trochantelli color.
Distribution.
Costa Rica.
Biology.
Solitary. Gelechiidae, gelJanzen 01 Janzen 394.
DNA barcoding data.
BIN BOLD: AAT 8840 (9 sequences, 9 barcode compliant).
Etymology.
Named in honor of Mr. Luis Hamilton in recognition of his recent and ongoing support for the financial and psychological well-being of Area de Conservación Guanacaste (ACG) and its NGO Guanacaste Dry Forest Conservation Fund (GDFCF) for the GDFCF BioAlfa initiative.
description: Published as part of Fernandez-Triana, Jose L., Boudreault, Caroline, Whitfield, James B., Höcherl, Amelie, Smith, M. Alex, Hallwachs, Winnifred & Janzen, Daniel H., 2025, A revision of the parasitoid wasp genus Dolichogenidea Viereck (Hymenoptera, Braconidae) in the Neotropical region, with the description of 102 new species, pp. 1-250 in ZooKeys 1237 on pages 1-250, DOI: 10.3897/zookeys.1237.141007
Lower bounds on lepton flavor violating branching ratios in a radiative seesaw model
Creators: name: Seto, Osamu
name: Shindou, Tetsuo
name: Tsuyuki, Takanao
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the lepton flavor violating decays such as $μ\to eγ$, $τ\to eγ$, $τ\to μγ$ in the three-loop radiative seesaw model proposed by Krauss, Nasri, and Trodden. In this model, the relevant coupling constants are larger for the heavier scalars that run inside loop diagrams to generate the appropriate magnitude of neutrino masses. Imposing a criterion that all the coupling constants must be small enough to be treated perturbatively, we find an upper bound on the mass of one of the scalars. By combining it with neutrino mass parameters, we derive lower bounds on the branching ratios of the lepton flavor violating processes. In a case with the inverted mass ordering and best-fit neutrino oscillation parameters, one of the lower bounds is $\text{Br}(μ\to eγ)>1.1\times 10^{-13}$, which is within the reach of the MEG~II experiment.
description: Published version in PRD, 18 pages, 6 figures
title: ÐÐ±Ð·Ð¾Ñ Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼Ð¾Ð² ÑÑÑÑ Ð¼ÐµÑÐ½Ð¾Ð¹ ÑÐµÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ð¸ Ð¿Ð¾ Ð´Ð²ÑÐ¼ÐµÑÐ½Ð¾Ð¼Ñ Ð¸Ð·Ð¾Ð±ÑÐ°Ð¶ÐµÐ½Ð¸Ñ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Neural network algorithms for 3D reconstruction
Creators: name: ÐÐµÐ¼ÑÐµÐ½ÐºÐ¾, ÐÐ»ÐµÐºÑÐ°Ð½Ð´Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2025
Subjects: 3d-ÑÐµÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ñ
Ð½ÐµÐ¹ÑÐ¾Ð½Ð½ÑÐµ ÑÐµÑÐ¸
ÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½Ð¾Ðµ Ð·ÑÐµÐ½Ð¸Ðµ
Ð½ÐµÐ¹ÑÐ¾ÑÐµÑÐµÐ²ÑÐµ Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼Ñ
Ð´Ð²ÑÐ¼ÐµÑÐ½Ð¾Ðµ Ð¸Ð·Ð¾Ð±ÑÐ°Ð¶ÐµÐ½Ð¸Ðµ
3d-reconstruction
neural networks
computer vision
neural network algorithms
two-dimensional image

description: Ð¦ÐµÐ»Ñ ÑÐ°Ð±Ð¾ÑÑ - ÐÑÐ¾Ð²ÐµÑÑÐ¸ ÑÑÐ°Ð²Ð½Ð¸ÑÐµÐ»ÑÐ½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð· ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÑ Ð½ÐµÐ¹ÑÐ¾ÑÐµÑÐµÐ²ÑÑ Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼Ð¾Ð² 3D-ÑÐµÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ð¸ Ð¿Ð¾ ÐºÑÐ¸ÑÐµÑÐ¸ÑÐ¼ ÐºÐ°ÑÐµÑÑÐ²Ð°, ÑÐºÐ¾ÑÐ¾ÑÑÐ¸ Ð¸ ÑÐµÑÑÑÑÐ¾ÐµÐ¼ÐºÐ¾ÑÑÐ¸, Ð° ÑÐ°ÐºÐ¶Ðµ Ð¾Ð¿ÑÐµÐ´ÐµÐ»Ð¸ÑÑ Ð¾Ð¿ÑÐ¸Ð¼Ð°Ð»ÑÐ½ÑÐµ Ð¼ÐµÑÐ¾Ð´Ñ Ð´Ð»Ñ ÑÐ°Ð·Ð»Ð¸ÑÐ½ÑÑ Ð¿ÑÐ¸ÐºÐ»Ð°Ð´Ð½ÑÑ ÑÑÐµÐ½Ð°ÑÐ¸ÐµÐ². ÐÐ° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð¾ÑÐµÐ½ÐºÐ¸ Ð¿Ð¾ Ð¼ÐµÑÑÐ¸ÐºÐ°Ð¼ PSNR, SSIM, Chamfer Distance Ð±ÑÐ» Ð²ÑÐ¿Ð¾Ð»Ð½ÐµÐ½ ÑÐµÐ¾ÑÐµÑÐ¸ÑÐµÑÐºÐ¸Ð¹ Ð°Ð½Ð°Ð»Ð¸Ð· Ð°ÑÑÐ¸ÑÐµÐºÑÑÑ Ð½ÐµÐ¹ÑÐ¾ÑÐµÑÐµÐ¹ Ð´Ð»Ñ ÑÑÐµÑÐ¼ÐµÑÐ½Ð¾Ð¹ ÑÐµÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸Ð¸. ÐÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð»Ð¸ÑÑ Ð¾ÑÐºÑÑÑÑÐµ Ð¾Ð±ÑÐ°Ð·Ð¾Ð²Ð°ÑÐµÐ»ÑÐ½ÑÐµ ÑÐµÑÑÑÑÑ Ð¸ Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ñ Ð¿Ð¾Ð¸ÑÐºÐ° Ð¸ Ð°Ð½Ð°Ð»Ð¸Ð·Ð° Ð¸Ð½ÑÐ¾ÑÐ¼Ð°ÑÐ¸Ð¸. ÐÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¾ (Ð¿ÑÐ¾ÑÐµÑÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¾) Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ð½Ð¾Ðµ Ð¾Ð±ÐµÑÐ¿ÐµÑÐµÐ½Ð¸Ðµ Ð½Ð° ÑÐ·ÑÐºÐµ Python.
description: The aim is to conduct a comparative analysis of modern neural network algorithms for 3D reconstruction based on quality, speed, and resource consumption criteria, as well as to determine optimal methods for various applied scenarios. A theoretical analysis of neural network architectures for 3D recinstruction was performed based on evaluation metrics such as PSNR, SSIM, and Chamfer Distance. Open educational resources and information search and analysis programs were used. Software written in Python was applied (tested).
From quantum speed limits to energy-efficient quantum gates
Creators: name: Aifer, Maxwell
name: Deffner, Sebastian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: While recent breakthroughs in quantum computing promise the nascence of the quantum information age, quantum states remain delicate to control. Moreover, the required energy budget for large scale quantum applications has only sparely been considered. Addressing either of these issues necessitates a careful study of the most energetically efficient implementation of elementary quantum operations. In the present analysis, we show that this optimal control problem can be solved within the powerful framework of quantum speed limits. To this end, we derive state-independent lower bounds on the energetic cost, from which we find the universally optimal implementation of unitary quantum gates, for both single and $N$-qubit operations.
description: 19 pages, 4 figures
Measurement of differential ZZ + jets production cross sections in pp collisions at $\sqrt{s}$ = 13 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Diboson production in association with jets is studied in the fully leptonic final states, pp $\to$ (Z$γ^*$)(Z/$γ^*$) + jets $\to$ 2$\ell$2$\ell'$ + jets, ($\ell,\ell'$ = e or $μ$) in proton-proton collisions at a center-of-mass energy of 13 TeV. The data sample corresponds to an integrated luminosity of 138 fb$^{-1}$ collected with the CMS detector at the LHC. Differential distributions and normalized differential cross sections are measured as a function of jet multiplicity, transverse momentum $p_\mathrm{T}$, pseudorapidity $η$, invariant mass and $Δη$ of the highest-$p_\mathrm{T}$ and second-highest-$p_\mathrm{T}$ jets, and as a function of invariant mass of the four-lepton system for events with various jet multiplicities. These differential cross sections are compared with theoretical predictions that mostly agree with the experimental data. However, in a few regions we observe discrepancies between the predicted and measured values. Further improvement of the predictions is required to describe the ZZ + jets production in the whole phase space.
description: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-22-001 (CMS Public Pages)
Precession of entangled spin and pseudospin in double quantum dots
Creators: name: Rohrmeier, Christoph
name: Donarini, Andrea
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum dot spin valves are characterized by exchange fields which induce spin precession and generate current spin resonances even in absence of spin splitting. Analogous effects have been studied in double quantum dots, in which the orbital degree of freedom, the pseudospin, replaces the spin in the valve configuration. We generalize, now, this setup to allow for arbitrary spin and orbital polarization of the leads, thus obtaining an even richer variety of current resonances, stemming from the precession dynamics of entangled spin and pseudospin. We observe for both vectors a delicate interplay of decoherence, pumping and precession which can only be understood by also considering the dynamics of the spin-pseudospin correlators. The numerical results are obtained in the framework of a generalized master equation within the cotunneling approximation and are complemented by the analytics of a coherent sequential tunneling model.
Hydrodynamic simulations of WD-WD mergers and the origin of RCB stars
Creators: name: Shiber, Sagiv
name: De Marco, Orsola
name: Motl, Patrick M.
name: Munson, Bradley
name: Marcello, Dominic C.
name: Frank, Juhan
name: Diehl, Patrick
name: Clayton, Geoffrey C.
name: Skinner, Bennett N.
name: Kaiser, Hartmut
name: Daiss, Gregor
name: Pfluger, Dirk
name: Staff, Jan E.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study the properties of double white dwarf (DWD) mergers by performing hydrodynamic simulations using the new and improved adaptive mesh refinement code Octo-Tiger. We follow the orbital evolution of DWD systems of mass ratio q=0.7 for tens of orbits until and after the merger to investigate them as a possible origin for R Coronae Borealis (RCB) type stars. We reproduce previous results, finding that during the merger, the Helium WD donor star is tidally disrupted within 20-80 minutes since the beginning of the simulation onto the accretor Carbon-Oxygen WD, creating a high temperature shell around the accretor. We investigate the possible Helium burning in this shell and the merged object's general structure. Specifically, we are interested in the amount of Oxygen-16 dredged-up to the hot shell and the amount of Oxygen-18 produced. This is critical as the discovery of very low Oxygen-16 to Oxygen-18 ratios in RCB stars pointed out the merger scenario as a favorable explanation for their origin. A small amount of hydrogen in the donor may help keep the Oxygen-16 to Oxygen-18 ratios within observational bounds, even if moderate dredge-up from the accretor occurs. In addition, we perform a resolution study to reconcile the difference found in the amount of Oxygen-16 dredge-up between smoothed-particle hydrodynamics and grid-based simulations.
description: 32 pages, Accepted to MNRAS
Supplementary document for Multiwavelength achromatic super-resolution focusing via metasurface-empowered controlled generation of focused cylindrically polarized vortex beams - 5967438.pdf
Creators: name: Wang, Junyi
name: Li, Fangfang
name: Kang, Guoguo
Publisher: name: Optica Publishing Group
Year: 2025
Subjects: Nanophotonics

description: Mode analysis
Magnetic field-temperature phase diagrams for multiple-$Q$ magnetic orderings: Exact steepest descent approach to long-range interacting spin systems
Creators: name: Kato, Yasuyuki
name: Motome, Yukitoshi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Multiple-$Q$ magnetic orderings represent magnetic textures composed of superpositions of multiple spin density waves or spin spirals, as represented by skyrmion crystals and hedgehog lattices. Such magnetic orderings have been observed in various magnetic materials in recent years, and attracted enormous attention, especially from the viewpoint of topology and emergent electromagnetic fields originating from noncoplanar magnetic structures. Although they often exhibit successive phase transitions among different multiple-$Q$ states while changing temperature and an external magnetic field, it is not straightforward to elucidate the phase diagrams, mainly due to the lack of concise theoretical tools as well as appropriate microscopic models. Here, we provide a theoretical framework for a class of effective spin models with long-range magnetic interactions mediated by conduction electrons in magnetic metals. Our framework is based on the steepest descent method with a set of self-consistent equations that leads to exact solutions in the thermodynamic limit, and has many advantages over existing methods such as biased variational calculations and numerical Monte Carlo simulations. Applying the framework to the models with instabilities toward triple- and hextuple-$Q$ magnetic orderings, we find that interesting reentrant phase transitions where the multiple-$Q$ phases appear only at finite temperature and/or nonzero magnetic field. Furthermore, we show that the multiple-$Q$ states can be topologically-nontrivial stacked skyrmion crystals or hedgehog lattices, which exhibit large net spin scalar chirality associated with nonzero skyrmion number. The results demonstrate that our framework could be a versatile tool for studying magnetic and topological phase transitions and related quantum phenomena in actual magnetic metals hosting multiple-$Q$ magnetic orderings.
description: 20 pages, 16 figures
Dolichogenidea luzmariaromeroae Fernandez-Triana & Boudreault 2025, sp. nov.
Creators: name: Fernandez-Triana, Jose L.
name: Boudreault, Caroline
name: Whitfield, James B.
name: Höcherl, Amelie
name: Smith, M. Alex
name: Hallwachs, Winnifred
name: Janzen, Daniel H.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea luzmariaromeroae

description: Dolichogenidea luzmariaromeroae Fernandez-Triana & Boudreault sp. nov.
Figs 89 A – F, 157 B
Type material.
Holotype. Costa Rica • Female, CNC; Alajuela, Area de Conservación Guanacaste, Sector Rincon Rain Forest, Sendero Anonas; 10.90528, -85.27882; 405 m; 02.vi.2011; Pablo Umana leg.; Host: phyBioLep 01 BioLep 758; Voucher code: DHJPAR 0043141; Host voucher code: 11-SRNP-42637.
Diagnostic description.
Propodeum with complete areola; T 1 1.7 × as long as wide at posterior margin; T 2 transverse, its width at posterior margin 3.5 × its central length; T 1 with strong sculpture on posterior 0.5; T 2 mostly sculptured but with some smooth areas near posterior margin; ovipositor sheath 0.7 × as long as metatibia length; tegula yellow, humeral complex half yellow half brown; all coxae, mesofemur and most of metafemur (except for anterior 0.2 which is yellow-white) brown to dark brown; body length: 2.45 mm; fore wing length: 2.63 mm. While D. luzmariaromeroae has T 2 almost entirely sculptured (in that sense it would appear to run through the first half of couplet 9), there are smooth areas near posterior margin that are different from other species with sculptured T 2. Additionally, this species can be distinguished by the color of its legs, tegula and humeral complex, length of ovipositor sheath, propodeum areola, and shape and sculpture of T 1 and T 2.
Distribution.
Costa Rica.
Biology.
Solitary. Pyralidae: Phycitinae, phyBioLep 01 BioLep 758.
DNA barcoding data.
BIN BOLD: ABX 5620 (3 sequences, 3 barcode compliant).
Etymology.
Named in honor of Sra. Luz Maria Romero, the primary technical guidance for the daily databasing and Species Pages done by the 30 - member parataxonomist program of GDFCF for ACG, as well as her two decades of inventing the Programa de Educacion Biologica (PEB) for Area de Conservación Guanacaste.
description: Published as part of Fernandez-Triana, Jose L., Boudreault, Caroline, Whitfield, James B., Höcherl, Amelie, Smith, M. Alex, Hallwachs, Winnifred & Janzen, Daniel H., 2025, A revision of the parasitoid wasp genus Dolichogenidea Viereck (Hymenoptera, Braconidae) in the Neotropical region, with the description of 102 new species, pp. 1-250 in ZooKeys 1237 on pages 1-250, DOI: 10.3897/zookeys.1237.141007
Dynamical Reorientation of Spin Multipoles in Silicon Carbide by Transverse Magnetic Fields
Creators: name: Hernández-Mínguez, A.
name: Poshakinskiy, A. V.
name: Hollenbach, M.
name: Santos, P. V.
name: Astakhov, G. V.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The long-lived and optically addressable high-spin state of the negatively charged silicon vacancy ($\mathrm{V_{Si}}$) in silicon carbide makes it a promising system for applications in quantum technologies. Most studies of its spin dynamics have been performed in external magnetic fields applied along the symmetry axis. Here, we find that the application of weak magnetic fields perpendicular to the symmetry axis leads to nontrivial behavior caused by dynamical reorientation of the $\mathrm{V_{Si}}$ spin multipole under optical excitation. Particularly, we observe the inversion of the quadrupole spin polarization in the excited state and appearance of the dipole spin polarization in the ground state. The latter is much higher than thermal polarization and cannot be induced solely by optical excitation. Our theoretical calculations reproduce well all sharp features in the spin resonance spectra, and shine light on the complex dynamics of spin multipoles in these kinds of solid-state systems.
description: 6 pages, 4 figures