bluuebunny/crossref_metadata_2025_split huggingface dataset:
ITO/MgSe interfaces designed as gigahertz/terahertz filters
Authors: Almotiri R A , Qasrawi A F 
Published: February 2023

Abstract
Herein a new class of MgSe gigahertz/terahertz band filters operatives in the frequency domain of 1.0 GHz-1.86 THz is fabricated and experimentally tested. MgSe band filters are coated onto glass and indium tin oxide (ITO) substrates by the thermal evaporation technique under a vacuum pressure of 10−5 mbar. Thin films of MgSe are structurally, morphologically, compositionally, optically and electrically characterized. It is observed that ITO substrates induce the growth of monophasic of MgSe, enhances the crystallinity of the films and blueshifts the energy band gaps of MgSe. Practical applications were verified by impedance spectroscopy technique through imposing an ac signal of driving frequency in the domain of 10.0 MHz-1.8 GHz between the terminals of ITO/MgSe/Au (IMA) devices. It is observed that the IMA devices exhibit negative capacitance effect. Analysis of the cutoff frequency spectra has shown that IMA devices can reveal wide range of tunability in the gigahertz frequency domain. In addition, the cutoff frequency spectra show values reaching ∼1.86 THz for signals of driving frequencies of ∼1.0 GHz. Evaluation of the magnitude of the reflection coefficient spectra and return loss spectra for these devices show that the IMA devices can perform as bandstop filters with return loss values exceeding 20 dB at 1.0 GHz. The features of the ITO/MgSe/Au devices are appropriate for the 5 G/6 G technology needs indicating that the device can be employed in communication technology and other gigahertz/terahertz applications.
Classical fermion dynamics in presence of non abelian monopoles
Authors: Morano Alejandro , Santillán Osvaldo P 
Published: February 2023

Abstract
In the present letter, the dynamics of a spin one-half particle with non abelian charge, interacting with a non abelian monopole like configuration, is studied. In the non spinning case, these equations correspond to the Wong ones S Wong (1970, Il Nuovo Cimento LXV, 4 689), and the associated dynamics has been extensively investigated in I Alekseev (1988, Theoret. and Math. Phys.
77 1273), L G Feher (1984, Acta Physica Polonica
15 920). The classical limit of a spinning particle in an abelian was considered in A Davis and W Perkins (1989, Phys. Lett. B
228 37), where an interpretation of the celebrated Callan-Rubakov effect C G Callan (1982, Phys. Rev. D
26 2058); V A Rubakov (1982, Nucl. Phys. B
203 311), V A Rubakov and M S Serebryakov (1983, Nucl. Phys. B
218 240); V A Rubakov (1981, JETP Len.
33 644). was obtained in purely classical terms The present work studies an interpolating situation, in which spin and non abelian charges are turned on. The corresponding equations are obtaining by taking into account some earlier works about spinning particles N Linden, A Macfarlane and J van Holten Czechoslovak (1996, J. Phys.
46 209), A Barducci, R Casalbuoni and L Lusanna (1977, Nuclear Physics B
124 93, A P Balachandran Per Salomson, B -S Skagerstam, and J -O Winnberg (1977, Phys. Rev. D
15 2308). The conservation laws are studied in this context, and it is found that energy and some generalization of angular momentum are conserved just in particular limits. This is a reflection that the non abelian interaction contains gauge field quartic interaction, which spoils the symmetries leading to these conservation laws. The precession of the particle is analyzed and compared with its abelian counterpart in this limit.
Trajectories of directed lattice paths
Authors: Janse van Rensburg EJ 
Published: February 2023

Abstract
The distribution of monomers along a linear polymer grafted on a hard wall is modelled by determining the probability distribution of occupied vertices of Dyck path and Dyck meander models of adsorbing linear polymers. For example, the probability that a Dyck path passes through the lattice site with coordinates

(
⌊
ϵ
n
⌋
,
⌊
δ

n

⌋
)

in the square lattice, for 0 < ϵ < 1 and δ ≥ 0, is determined asymptotically as n → ∞ and this uncovers the probability density of vertices along Dyck paths in the limit as the length of the path n approaches infinity:

P

(
D
)

(
ϵ
,
δ
)
=

4

δ

2

π

ϵ

3

1
−
ϵ

3

e

−

δ

2

/

ϵ
(
1
−
ϵ
)

.

The properties of a polymer coating of a hard wall and the density or distribution of monomers in the coating is relevant in applications such as the stabilisation of a colloid dispersion by a polymer or in a drug delivery system such as a drug-eluding stent covered by a grafted polymer.
Magnetic field control and swift heavy ion beam assisted tuning of resistive switching properties of BSFO/CFO/LNO heterostructures
Authors: Thankachen Nisha , Chhaya U V , Tripathi A , Joshi U S 
Published: February 2023

Abstract
Resistive switching (RS) behavior in mixed oxide insulators has shown a great promise as memristors or non-volatile resistive random-access memory (RRAM) applications. For dilute magnetic oxide multilayers, a novel approach of controlled defects induced and the magnetic field control of RS behavior is proposed. Resistive switching in Bi0.6Sr0.4FeO3 /CoFe2O4 /LaNiO3 (BSFO/CFO/LNO) multilayer heterostructures has been investigated as a case study. All oxide junctions consisting of conducting LaNiO3 (LNO) bottom electrode and BSFO-CFO active layers were fabricated by using chemical solution deposition. A set of samples were irradiated with 150 MeV Ag11+ ions for three different ion fluence of ∼1 × 10+11 ions cm−2, 1 × 10+12 ions cm−2 and 5 × 10+12 ions cm−2. Polycrystalline phase pure films with smooth, crack free surfaces were observed for pristine and irradiated samples. Optical spectroscopy revealed a decrease in the transmittance upon increasing ion fluence due to increase in the light scattering centres. The optical band gap showed a systematic decrease from 2.09 eV to 1.65 eV with increasing ion fluence. Room temperature I-V characteristics showed consistent and pronounced bipolar switching for all samples below ± 5 V. Upon applied magnetic fields of 0.58 T, the resistive switching ratios were found to increase significantly and were further tuned by 150 MeV Ag11+ ion beam irradiations. The magnetic field control of electrical transport properties in the controlled defect assisted oxide heterojunctions offers new insights to the existing understanding of oxide-based RS mechanism.
Analysis of thermodynamic resistive switching in ZnO-based RRAM device
Authors: Bature Usman Isyaku , Nawi Illani Mohd , Khir Mohd Haris Md , Zahoor Furqan , Ba Hashwan Saeed S , Algamili Abdullah Saleh , Abbas Haider 
Published: February 2023

Abstract
Due to its excellent performance, resistive random access memory (RRAM) has become one of the most appealing and promising types of memory. However, RRAM has significant problems concerning understanding and modelling the resistive-switching mechanism, despite being very promising from the perspectives of scalability and techniques. This paper presents an analysis of thermodynamic resistive switching and fundamentals of thermal energy flow in a ZnO-based RRAM stack. The field and thermal energy flow within the device are analysed using the thermodynamic process. The influence of parameter variations during the SET and RESET operations is shown and their effect on the switching characteristic is characterized. The real I-V characteristics show fixed current vibrations and field-driven ion transport is evidenced and more prominent at higher currents. It shows that the nucleation of the filament as well as the growth of the gap complements the increase in the free energy (FE) of the system. These studies contribute to better comprehension and account for SET-RESET characteristics, rightly unfolding the thermal energy flow during dynamic switching operations that causes device degradation and allowing stability for future data storage projections.
Differential cross sections for projectile scattering angle in proton-helium collision at intermediate energies
Authors: Igarashi A , Kato D 
Published: February 2023

Abstract
The collisions between proton and helium are treated with a semi-classical atomic orbital expansion for proton incident energies 5–150 keV considering two-electrons explicitly. Differential cross sections with respect to the projectile scattering angle are calculated for elastic scattering, 21S and 21P excitation, single electron capture, and single ionization. The agreement with experiments are mostly good, but non-negligible discrepancies are seen for the elastic scattering and the single electron capture with target excitation.
Constraints on dark matter scattering with long lived mediators from observations of the Sun with the Fermi Large Area Telescope
Authors: Serini D. , Loparco F. , Mazziotta M.N. , De Gaetano S. , Di Venere L. , Gargano F. , Lorusso L. , Panzarini G. , Pillera R. 
Published: February 2023

Abstract
The Sun represents a promising target for indirect dark matter searches, as dark matter particles from the Galactic halo can be gravitationally trapped in its core or in external orbits, and their annihilations can lead to final states with standard model particles that are able to reach the Earth. In this work we have considered a scenario in which dark matter particles can annihilate into pairs of long-lived mediators, which in turn can escape from the Sun and decay into pairs of gamma rays or into the bb̅, τ
+
τ
-, μ
+
μ
- channels, with the production of gamma rays in the final states. All these processes are expected to yield an excess in the energy spectrum of gamma rays towards the Sun. We have therefore analyzed the data collected by the Fermi Large Area Telescope during its first 13.5 years of operation, searching for possible excesses in the solar gamma-ray spectrum. Since no statistically significant excess is found, we have set constraints on the dark matter-nucleon scattering cross sections in both the spin-dependent and spin-independent cases. For all the mediator decay channels explored and for dark matter masses between a few GeV/c2 and 1 TeV/c2, we have found that the upper limits on the spin-dependent and spin-independent cross sections are in the ranges from 10-45 to 10-39 cm2 and from 10-47 up to 10-42 cm2, respectively.
A closer look at the seesaw-dark matter correspondence
Authors: Coy Rupert , Gupta Aritra 
Published: February 2023

Abstract
In an earlier work [1], we showed that in very simple neutrino portal-like
extensions of the Standard Model it is possible to achieve a one-to-one correspondence between
dark matter physics and the seesaw parameters controlling the genesis of neutrino masses.
Notably, this can occur both when the dark matter is produced via freeze-in and relativistic
freeze-out. In this article, we carry out a detailed phenomenological study of such
scenarios. Specifically, we find the allowed regions for the neutrino portal coupling within which
the correspondence is valid. We further constrain the parameter space from various observational
and theoretical considerations. Within this, we derive the distribution function of a doubly
frozen-in particle in order to more accurately compute its free-streaming horizon.
Variation of UV-A/UV-B daily profiles depending on locations and altitude
Authors: Tyutyundzhiev Nikolay , Angelov Christo , Arsov Todor , Nitchev Hristo , Lovchinov Konstantin , Mutafov Asen 
Published: February 2023

AbstractSolar UV/visible monitoring has increased its importance in the recent years due to the global warming, unexpected atmospheric anomalies and storms, and the increasing needs for additional human protection. In mountain areas with high elevation the interest to UV irradiation measurements is expected to increase due to atmospheric transparency, however frequent events of lightning and risk of equipment failures has to be taken into account. The cost of the UV measurement systems can be greatly reduced by employing low-cost integrated inexpensive digital sensors with on-chip signal conditioning as detectors which are more convenient for field deployment and outdoor measurements. Thus, a compact portable UV/visible sensor equipment is in great demand for annual solar irradiation monitoring and seasonal all-day measurement campaigns. In this work, we report on the development of an in-house portable UV sensor system based on digital sensors with I2C communication, open-source hardware and software. The developed equipment is based on integrated digital sensors (VEML 6075, TSL 2591). It has been developed by employing Wi-Fi ESP 32 microcontroller, ODROID microcomputer and open-source software (InfluxDB and Grafana visualization tool). We investigate the system performance by measuring daily profiles of UV-B/UV-A irradiation in different locations and under different atmospheric conditions in order to evaluate its feasibility for prevention of humans from UV overexposure during outdoor operations. On-field tests are performed for 2 years in 7 different locations in Bulgaria. Interestingly, in downtown during particular days with high traffic an increased UV scattering and absorption due to urban pollution has been observed.
Preparation and characterization of RF sputtered ZnO layers for application in thin films solar cells
Authors: Spasova S. , Dikov Hr. , Ganchev M. 
Published: February 2023

Abstract
Transparent conductive electrodes (TCO) serve as window and contact layers and they should combine high optical transmittance with low electrical resistivity. Recently ZnO has been considered to be the most promising TCO material in view of cost and properties. Chalcopyrite based solar cells commonly consist of Cu(In,Ga)Se2 (CIGS) absorber layer and a sputter sequence of undoped and doped ZnO layers in a structure: glass/Mo/CIGS/CdS/ZnO/ZnO:Al. In some cases, ZnO plays the role of the buffer layer itself as an alternative of the mostly used toxic CdS. An advanced application of this material is considered to be involving in Organic Solar Cells (OSCs) as Electron Transporting Material (ETM). The work presents fabrication of uniform resistive thin (50-100 nm) undoped ZnO films serving as buffer layers and conductive Al-doped ZnO films (Al:ZnO) with thickness in the range of 100-500 nm. In the latter case the film thickness was optimized to combine high transmittance and low resistivity. Both types of films are with good adhesion and possess a transmittance over 90% in the visible region. Highly transparent bi-layer films (ZnO/ZnO:Al) were finally embedded in the solar cell structure: glass/Mo/CIGS/ZnO/ZnO:Al/Al.
On the relation of the potential energy landscape and the cooperatively rearranging region
Authors: Solunov Hristo 
Published: February 2023

Abstract
In an extension of Adam-Gibbs’ theory, an equation for the measuring the size of cooperatively rearranging region has been found and interpreted as the number of the beads rearranging during the relaxation time. A relation for the partitioning the molecules to the number of the beads has been also suggested. The size of the cooperatively rearranging region has been found to be the molecular basis of the fragility for the glass forming liquids. In the potential eenergy landscape, the maximal number of the potential minima in the configuration space is assumed to be measure of the fragility. Here, a relation between the size of the cooperatively rearranging region and the parameters in the model functions determining the maximal number of the potential minima (inherent structures) is suggested. For the first time the total number of minima per the mole molecule and per mol of the beads are compared. Two of the most fragile liquids, toluene and o-terphenyl are investigated, and it is found that the molecular, the kinetic and the thermodynamic measures for the fragility are correlated with the maximal number of minima in the mol of the beads but not in that of the mol of the molecules.
Cyanide Molecular Laser-Induced Plasma Spectroscopy
Authors: Parigger C G , Helstern C M 
Published: February 2023

Abstract
This work communicates recent measurements of CN in laser-induced plasma. The main goals and objectives comprise (a) exploring CN measurement using optical emission spectroscopy in optical breakdown plasma; (b) determining the effects of laser-induced shockwave for time delays of the order of 1 μs; (c) evaluating the spatial distribution of CN signals; (d) inferring CN temperature distribution; and (e) associating recorded shadowgraphs with laser-spectroscopy results. Q-switched, 150 mJ, 6 ns pulsed Nd:YAG laser radiation at the fundamental wavelength of 1064 nm is used to generate micro-plasma in a gas mixture with ultra-high purity nitrogen and research grade carbon dioxide. The CO2 to N2 molar ratio is 1 to 1 for the gaseous mixture near atmospheric pressure flowing through the chamber. Optical emissions are dispersed by a 0.64-m Czerny-Turner spectrometer and an intensified charge-coupled device records the data along the wavelength and slit dimensions. The analysis utilizes Abel integral inversion techniques for determination of spatiotemporal profiles.
Study of arsenic resonance spectral lines in far UV region from a HFEDL for usage in Zeeman absorption spectroscopy
Authors: Zorina Natalja , Abola Anda , Skudra Atis , Revalde Gita 
Published: February 2023

Abstract
This work is focused on obtaining and analyzing the main spectral characteristics of a high-frequency electrodeless light source filled with arsenic for use in high-precision atomic absorption analyzers. We analyzed the relative intensities of the three arsenic resonance spectral lines 189.0 nm, 193.7 nm, and 197.3 nm in the far UV spectral region, the dependence of the intensity on the applied voltage, the impact of the instrumental function on the emission spectra, the influence of self-absorption and the stability of the radiation. Among others, a deconvolution procedure was implemented to obtain the real shapes of the emitted profiles.
Accurately computed H2–He collision-induced absorption coefficients for modeling of planetary atmospheres
Authors: Gustafsson Magnus 
Published: February 2023

Abstract
Accurate collision-induced absorption profiles for H2–He pairs, in the rototranslational band of H2, are computed accounting for the full anisotropic interaction potential. The calculations are time consuming and complicated compared to those pursued in the isotropic potential approximation. A machine learning approach is implemented in order to produce highly accurate data on a dense frequency grid, by combining data computed in the full calculation with those from the isotropic approximation. Thus an extensive, highly accurate, data base can be obtained for a set of frequencies, temperatures, and ortho-H2/para-H2 fractions, appropriate for use in modeling of planetary atmospheres, in particular of the gas giants.
Reconstruction of charged tracks with Timepix4 ASICs
Authors: Akiba K. , van Beuzekom M. , van Beveren V. , Byczynski W. , Coco V. , Collins P. , Dall'Occo E. , Dumps R. , Evans T. , Geertsema R. , Gkougkousis E.L. , Halvorsen M.M. , van der Heijden B. , Heijhoff K. , Lemos Cid E. , Pajero T. , Rolf D. , Schindler H. 
Published: February 2023

Abstract
The spatial and temporal performance of a four-plane system
composed of silicon sensors bump-bonded to Timepix4 ASICs is
assessed with a 180 GeV/c mixed hadron beam at the CERN SPS and
reported in detail. Particle tracks are reconstructed using
time-space measurements from the four detector planes, two
100 μm planes perpendicular to the beam and two 300 μm
sensors under an angle of 9°. The spatial hit resolution
is assessed to be (15.5 ± 0.5) μm and (4.5 ± 0.3) μm
for 100 μm and 300 μm thick sensors, respectively.
The timestamps from the detectors are also measured with fine
precision, yielding time resolutions of (452 ± 10) ps,
(420 ± 10) ps, (639 ± 10) ps, (631 ± 10) ps for the two
100 μm and two 300 μm thick sensors respectively.
These measurements are combined to a track time resolution of
(340 ± 5) ps. The design of the detector system is described
together with its data acquisition system, operational
infrastructure, and dedicated software.
Inverse scattering transforms for the nonlocal Hirota–Maxwell–Bloch system
Authors: An Ling , Chen Yiren , Ling Liming 
Published: February 2023

Abstract
The Hirota and Maxwell–Bloch (H-MB) system is a mathematical model that can be used to describe the wave propagation in an erbium-doped nonlinear fiber with higher-order dispersion. By extending the parameter ω in the H-MB system to the complex domain, all the nonlocal forms of the H-MB system, including the reverse-space-time, complex reverse-space, complex reverse-time, complex reverse-space-time H-MB systems, are found. Then the Riemann–Hilbert problem of the nonlocal H-MB system is established to analyze the corresponding inverse scattering problem and construct the corresponding soliton solutions. When N = 1, the singularity of the one-soliton solutions of each nonlocal H-MB system is analyzed. When N = 2, we take the nonlocal reverse-space-time H-MB system and the nonlocal complex reverse-time H-MB system as examples, showing that a two-soliton can also be regarded as a superposition of two single-soliton in the nonlocal cases as

|

t

|

→
∞

.
Clusters in the critical branching Brownian motion
Authors: Ferté Benoît , Le Doussal Pierre , Rosso Alberto , Cao Xiangyu 
Published: February 2023

Abstract
Brownian particles that are replicated and annihilated at equal rate have strongly correlated positions, forming a few compact clusters separated by large gaps. We characterize the distribution of the particles at a given time, using a definition of clusters in terms of a coarse-graining length recently introduced by some of us. We show that, in a non-extinct realization, the average number of clusters grows as

∼

t

D

f

/

2

where

D

f

≈
0.22

is the Hausdorff dimension of the boundary of the super-Brownian motion (SBM), found by Mueller, Mytnik, and Perkins. We also compute the distribution of gaps between consecutive particles. We find two regimes separated by the characteristic length scale

ℓ
=

D

/

β

where D is the diffusion constant and β the branching rate. The average number of gaps greater than g decays as

∼

g

D

f

−
2

for

g
≪
ℓ

and

∼

g

−

D

f

for

g
≫
ℓ

. Finally, conditioned on the number of particles n, the above distributions are valid for

g
≪

n

; the average number of gaps greater than

g
≫

n

is much less than one, and decays as

≃

4
(
g

/

n

)

−
2

, in agreement with the universal gap distribution predicted by Ramola, Majumdar, and Schehr. Our results interpolate between a dense SBM regime and a large-gap regime, unifying two previously independent approaches.