bluuebunny/crossref_metadata_2025_split huggingface dataset:
On nonlinear effects in multiphase WKB analysis for the nonlinear Schrödinger equation
*
Authors: Carles Rémi 
Published: May 2024

Abstract
We consider the Schrödinger equation with an external potential and a cubic nonlinearity, in the semiclassical limit. The initial data are sums of WKB states, with smooth phases and smooth, compactly supported initial amplitudes, with disjoint supports. We show that like in the linear case, a superposition principle holds on some time interval independent of the semiclassical parameter, in several régimes in term of the size of initial data with respect to the semiclassical parameter. When nonlinear effects are strong in terms of the semiclassical parameter, we invoke properties of compressible Euler equations. For weaker nonlinear effects, we show that there may be no nonlinear interferences on some time interval independent of the semiclassical parameter, and interferences for later time, thanks to explicit computations available for particular phases.
Study on the plume self-neutralization of ionic liquid electrospray thruster based on median potential
Authors: Du Zening , Wu Zhiwen , Li Jin , Sun Wei , Li Pengkun , Guo Yuntao 
Published: May 2024

Abstract
Ionic liquid electrospray thruster (ILET) has the advantages of high specific impulse, precise thrust control, and low structural mass, which make it ideal for small satellites. The charged particles of ILET’s plume may lead to device charging or even damage, restricting its engineering applications. Thus, this paper examines the self-neutralization effectiveness of the ILET’s plume under various emission conditions using particle-in-cell simulations. In order to accurately evaluate the self-neutralization effectiveness of the ILET’s plume, the median potential is explained in this paper and its reasonableness as the evaluation criterion for self-neutralization of the plume is verified. The working envelope for achieving self-neutralization of the ILET’s plume is determined by simulating the bipolar plume under various emission conditions. The results indicate that when the highest and lowest potentials are the same, the average electric field strength between two points in space with a better degree of neutrality is 200% higher compared to points with a lesser degree of neutrality. The study determines the working envelope to realize self-neutralization of the ILET’s plume with an effectiveness of 70%. When the emission voltage of the anode thruster is fixed, the range of the cathode thruster’s voltage ranges from 108.36 to 228.74 V. The asymmetry between the anode and cathode emissions of the ILET prototype significantly influences the operational range of the cathode thruster. Greater asymmetry leads to a narrower operating range for the ILET to achieve self-neutralization of the plume. This study serves as a guide for the ILET to achieve self-neutralization of the plume.
Design considerations for a long-wavelength InAsSb detector diode
Authors: Svensson Stefan P , Beck William A , Donetsky Dmitri , Kipshidze Gela , Belenky Gregory 
Published: May 2024

Abstract
InAsSb can absorb light across the entire long wavelength range (8–12 μm) and shares many of the other relevant basic materials properties of HgCdTe, the current incumbent detector technology for this band. We discuss here the device architectures in relation to the crystal growth technical aspects using molecular beam epitaxy and propose a simplified design consisting of an InAsSb absorber with a graded wider bandgap top layer of lattice matched AlInAsSb that exhibits a spontaneously formed p–n-junction. The 77 K device performance is predicted with a numerical model that indicates that quantum efficiencies of at least 75% should be achievable.
Thermal management and switching performance of β-Ga2O3 vertical FinFET with diamond-gate structure
Authors: Li Yehong , Zheng Xuefeng , Zhang Fang , He Yunlong , Yuan Zijian , Wang Xinyang , Wang Yingzhe , Ma Xiaohua , Hao Yue 
Published: May 2024

Abstract
In this paper, a beta-phase gallium oxide (β-Ga2O3) vertical FinFET with diamond-gate has been studied by Silvaco-ATLAS simulation. The diamond-gate structure achieves adjustable pin (p-insulator-n) junction owing to the diamond-SiO2-Ga2O3 heterostructure. This design also enhances heat dissipation by virtue of the high thermal conductivity of the diamond. Compared to conventional FinFETs, the diamond-gate FinFET (DG-FinFET) reduces the static operating temperature rise by around 17.30%. Additionally, due to its greater heat dissipation capacity, DG-FinFETs provide a 5.84% increase in current density at 1 kA cm−2 current density level. The structural changes in the diamond-gate also result in a significant reduction in the gate-source capacitance (C
GS). At 1 MHz operating frequency and the same gate voltage, DG-FinFETs have 69.29% less gate-source charge (Q
GS), 70.80% less charge/discharge delay time, 73.70% less switching loss, and 57.15% less conduction loss. Overall, the simulation and analysis presented in this work indicate a promising advancement of the DG-FinFET structure in high-power and rapid switching applications.
Long-range pairing in monolayer NbSe2 facilitates the emergence of topological superconducting states
Authors: Li Y Z , Gao Q , Li Y R , Zhong J X , Meng L J 
Published: May 2024

Abstract
The paper systematically study topological superconducting (TSC) phases in monolayer NbSe2 by constructing the hybrid paring tight-binding model of mixing on-site s-wave pairing (ps
) and long-range pairing (p
A1) for the first time. We observe rich phases with both fixed and sensitive Chern numbers (CNs) depending on the chemical potential (μ) and out-of-plane magnetic field (Vz
). As p
A1 increases, the TSC phase manifests matching and mismatching features according to whether the CNs match with the number of topological edge states (TESs). Strikingly, the introduction of long-range pairing significantly reduces the critical Vz
to form TSC phases compared with the pure on-site s-wave paring. Moreover, the TSC phases can be modulated even at Vz
= 0 under appropriate μ and p
A1, which is identified by the robust TESs of ribbons. Additionally, the long-range pairing influences the hybridization of bulk and edge states, resulting in a matching/mismatching bulk-boundary correspondence with localized/oscillating TESs on the ribbons. Our findings are helpful for realizing TSC states through compressive strain experimentally to strengthen long-range pairings, as well as designing and regulating TSC materials.
Topological nano-switches in higher-order topological insulators
Authors: Poata Joseph , Taddei Fabio , Michele Governale  
Published: May 2024

Abstract
We consider multi-terminal transport through a flake of rectangular shape of a two-dimensional topological insulator in the presence of an in-plane magnetic field. This system has been shown to be a second-order topological insulator, thus exhibiting corner states at its boundaries. The position of the corner states and their decay length can be controlled by the direction of the magnetic field. In the leads we assume that the magnetic field is absent and therefore we have helical one-dimensional propagating states characteristic of the spin-Hall effect. Using a low-energy effective Hamiltonian we show analytically that, in a two-terminal setup, transport can be turned on and off by a rotation of the in-plane magnetic field. Similarly, in a three terminal configuration, the in-plane magnetic field can be used to turn on and off the transmission between neighbouring contacts, thus realising a directional switch. Analytical calculations are supplemented by a numerical finite-difference method. For small values of the Fermi energy and field strength, the analytical results agree exceptionally well with the numerics. The effect of disorder is also addressed in the numerical approach. We find that the switching functionality is remarkably robust to the presence of strong disorder stemming from the topological nature of the states contributing to the electron transport.
Elastic scattering cross sections and transport of tin ions in extreme ultraviolet lithography sources
Authors: Bartlett Nathan , Herschberg Andrew , Crouse Jameson , Dallal Tamar , Nuttal Jake , Stahl Jack , Braaksma Niels , Ruzic David 
Published: May 2024

Abstract
Energetic tin ions are created by laser produced plasmas in extreme-ultraviolet lithography sources where hydrogen must be used as a buffer gas to protect critical optical components. In this study, the quantum chemistry code NWChem is used to calculate the interatomic potential between singly ionized tin and molecular hydrogen. The interatomic potential was fit by an inverse-power potential, a modified universal ZBL potential, and a two-piece-Lennard-Jones potential which were in turn used to calculate the classical distance of closest approach, scattering angle, total elastic scattering cross sections. Furthermore, the universal Ziegler-Biersack-Littmark (ZBL) potential was used in the open-source binary collision approximation codes RustBCA as well as Stopping Range in Matter and Transport of Ion in Matter (SRIM/TRIM) to calculate ion ranges, straggling, and stopping cross sections in a hydrogen gas target.
Dynamics of rapidly rotating Bose–Einstein quantum droplets
Authors: Cheng Szu-Cheng , Wang Yu-Wen , Kuan Wen-Hsuan 
Published: May 2024

Abstract
This study presents a detailed analysis of the stationary properties and dynamics of an anharmonically trapped, rapidly rotating Bose–Einstein liquid droplet. We investigate the effects of the particle number, confining potential, and rotation speed on the formation of the energetically favored bead, multiple quantized vortex, off-center vortex, and center-of-mass states. The multi-periodic trajectories and breathing provide evidence of the collective excitations of the surface mode in the vortex states. Observation of the self-trapping phenomenon and tendency toward the lowest Landau level in rapid rotation regimes coincides well with the quantum-Hall limit. Modifying the topological charges and destroying the potential flow of the vortex state can occur if an external disturbance is imposed upon the quantum droplet.
Weak-scale Higgs inflation
Authors: Yin Wen 
Published: May 2024

Abstract
The present measurement of the Standard Model (SM) parameters suggests that the Higgs effective potential has a maximum at the Higgs field value of approximately 1011GeV, and the electroweak (EW) vacuum is not absolutely stable. To achieve absolute EW stability, a very large Higgs-Ricci scalar non-minimal coupling can be introduced.
I study cosmic inflation driven by the Higgs field in this extension of the SM and refer to it as “weak-scale Higgs inflation” because the resulting inflationary Hubble parameter is around the weak scale. The Palatini formulation of gravity with a dimension 6 term is shown to drive successful inflation. I also argue for the UV (in)sensitivity of the predictions, and phenomenological implications. In the metric formulation case, the scenario for stable EW vacuum may be probed by measuring the Higgs coupling in future colliders.
Fluctuation-dissipation relation in cosmic microwave background
Authors: Ota Atsuhisa 
Published: May 2024

Abstract
We study the fluctuation-dissipation relation for sound waves in the cosmic microwave background (CMB), employing effective field theory (EFT) for fluctuating hydrodynamics.
Treating sound waves as the linear response to thermal radiation, we establish the fluctuation-dissipation relation within a cosmological framework.
While dissipation is elucidated in established linear cosmological perturbation theory, the standard Boltzmann theory overlooks the associated noise, possibly contributing to inconsistencies in Lambda Cold Dark Matter (ΛCDM) cosmology. This paper employs EFT for fluctuating hydrodynamics in cosmological perturbation theory, deriving sound wave noise.
Notably, the long-time limit of the noise spectrum is independent of viscosity details, resembling a Brownian motion bounded in a harmonic potential.
The net energy transfer between the sound wave system and the radiation environment reaches a balance within Hubble time, suggesting the thermal equilibrium of the sound waves themselves.
The induced density power spectrum is characterized as white noise dependent on the inverse of the entropy density, which is negligibly small on the CMB scale. The energy density of the entire sound wave system scales as a
-4, akin to radiation. While the numerical factor is not determined in the present calculation, the back reaction of the sound wave system to the background radiation may not be negligible, serving as a potential source for various fitting issues in ΛCDM cosmology.
EFTofLSS meets simulation-based inference: σ
8 from biased tracers
Authors: Tucci Beatriz , Schmidt Fabian 
Published: May 2024

Abstract
Cosmological inferences typically rely on explicit expressions for the likelihood and covariance of the data vector, which normally consists of a set of summary statistics. However, in the case of nonlinear large-scale structure, exact expressions for either likelihood or covariance are unknown, and even approximate expressions can become very cumbersome, depending on the scales and summary statistics considered. Simulation-based inference (SBI), in contrast, does not require an explicit form for the likelihood but only a prior and a simulator, thereby naturally circumventing these issues. In this paper, we explore how this technique can be used to infer σ
8 from a Lagrangian effective field theory (EFT) based forward model for biased tracers. The power spectrum and bispectrum are used as summary statistics to obtain the posterior of the cosmological, bias and noise parameters via neural density estimation. We compare full simulation-based inference with cases where the data vector is drawn from a Gaussian likelihood with sample and analytical covariances. We conclude that, for k
max = 0.1hMpc-1 and 0.2hMpc-1, the form of the covariance is more important than the non-Gaussianity of the likelihood, although this conclusion is expected to depend on the cosmological parameter inferred, the summary statistics considered and range of scales probed.
Hunting WIMPs with LISA: correlating dark matter and gravitational wave signals
Authors: Bringmann Torsten , Gonzalo Tomás E. , Kahlhoefer Felix , Matuszak Jonas , Tasillo Carlo 
Published: May 2024

Abstract
The thermal freeze-out mechanism in its classical form is tightly connected to physics
beyond the Standard Model around the electroweak scale, which has been the target of enormous
experimental efforts. In this work we study a dark matter model in which freeze-out is triggered
by a strong first-order phase transition in a dark sector, and show that this phase transition
must also happen close to the electroweak scale, i.e. in the temperature range relevant for
gravitational wave searches with the LISA mission. Specifically, we consider the spontaneous
breaking of a U(1)′ gauge symmetry through the vacuum expectation value of a scalar field,
which generates the mass of a fermionic dark matter candidate that subsequently annihilates into
dark Higgs and gauge bosons. In this set-up the peak frequency of the gravitational wave
background is tightly correlated with the dark matter relic abundance, and imposing the observed
value for the latter implies that the former must lie in the milli-Hertz range. A peculiar feature
of our set-up is that the dark sector is not necessarily in thermal equilibrium with the Standard
Model during the phase transition, and hence the temperatures of the two sectors evolve
independently. Nevertheless, the requirement that the universe does not enter an extended period
of matter domination after the phase transition, which would strongly dilute any gravitational
wave signal, places a lower bound on the portal coupling that governs the entropy transfer between
the two sectors. As a result, the predictions for the peak frequency of gravitational waves in the
LISA band are robust, while the amplitude can change depending on the initial dark sector
temperature.
Gamma-ray spectra of the Crab, Vela and Geminga pulsars fitted with SED of the emission from their current sheet
Authors: Ardavan Houshang 
Published: May 2024

Abstract
We show that the spectral energy distribution (SED) of the tightly focused radiation
generated by the superluminally moving current sheet in the magnetosphere of a non-aligned neutron
star fits the gamma-ray spectra of the Crab, Vela and Geminga pulsars over the entire range of
photon energies so far detected by Fermi-LAT, MAGIC and HESS from them: over 102 MeV to 20
TeV. While emblematic of any emission that entails caustics, the SED introduced here radically
differs from those of the disparate emission mechanisms currently invoked in the literature to fit
the data in different sections of these spectra. We specify, moreover, the connection between the
values of the fit parameters for the analysed spectra and the physical characteristics of the
central neutron stars of the Crab, Vela and Geminga pulsars and their magnetospheres.
Calibration requirement for Epoch of Reionization 21-cm signal observation. Part III. Bias and variance in uGMRT ELAIS-N1 field power spectrum
Authors: Gayen Saikat , Sagar Rashmi , Mangla Sarvesh , Dutta Prasun , Roy Nirupam , Chakraborty Arnab , Kumar Jais , Datta Abhirup , Choudhuri Samir 
Published: May 2024

Abstract
Power spectrum of H i 21-cm radiation is one of the promising probes to study
large scale structure of the universe and understand galaxy formation and evolution. The presence
of foregrounds, that are orders of magnitude larger in the same frequency range of the redshifted
21-cm signal has been one of the largest observational challenges. The foreground contamination
also hinders the calibration procedures and introduces residual calibration errors in the
interferometric data. It has been shown that the calibration errors can introduce bias in the
21-cm power spectrum estimates and introduce additional systematics. In this work, we assess the
efficacy of 21-cm power spectrum estimation for the uGMRT Band-3 observations of the ELAIS-N1
field. We first evaluate the statistics of the residual gain errors and perform additional
flagging based on these statistics. We then use an analytical method to estimate the bias and
variance in the power spectrum. We found that (a) the additional flagging based on calibration
accuracy help reduce the bias and systematics in the power spectrum, (b) the majority of the
systematics at the lower angular scales, ℓ< 6000, are due to the residual gain errors, (c)
for the uGMRT baseline configuration and system parameters, the standard deviation is always
higher than the bias in the power spectrum estimates. Based on our analysis we observe that for an
angular multipole of ℓ∼3000, 2000 hours of `on source time' is required with the uGMRT
to detect redshifted 21-cm signal at 3-σ significance from a redshift of 2.55. In this
work we only consider the power spectrum measurement in the plane of the sky, an assessment of
residual gain statistics and its effect on multifrequency angular power spectrum estimation for
the uGMRT and the SKA like telescopes will be presented in a companion paper.
Discrete Boltzmann model with split collision for nonequilibrium reactive flows*
Authors: Lin Chuandong , Luo Kai H , Lai Huilin 
Published: May 2024

Abstract
A multi-relaxation-time discrete Boltzmann model (DBM) with split collision is proposed for both subsonic and supersonic compressible reacting flows, where chemical reactions take place among various components. The physical model is based on a unified set of discrete Boltzmann equations that describes the evolution of each chemical species with adjustable acceleration, specific heat ratio, and Prandtl number. On the right-hand side of discrete Boltzmann equations, the collision, force, and reaction terms denote the change rates of distribution functions due to self- and cross-collisions, external forces, and chemical reactions, respectively. The source terms can be calculated in three ways, among which the matrix inversion method possesses the highest physical accuracy and computational efficiency. Through Chapman–Enskog analysis, it is proved that the DBM is consistent with the reactive Navier–Stokes equations, Fick's law and the Stefan–Maxwell diffusion equation in the hydrodynamic limit. Compared with the one-step-relaxation model, the split collision model offers a detailed and precise description of hydrodynamic, thermodynamic, and chemical nonequilibrium effects. Finally, the model is validated by six benchmarks, including multicomponent diffusion, mixture in the force field, Kelvin–Helmholtz instability, flame at constant pressure, opposing chemical reaction, and steady detonation.
Slowly rotating charges from Weyl double copy for Kerr black hole with Chern–Simons correction
Authors: Liu Yi-Ran , Zhang Jing-Rui , Zhang Yun-Long 
Published: May 2024

Abstract
The Weyl double copy builds the relation between gauge theory and gravity theory, in particular the correspondence between gauge solutions and gravity solutions. In this paper, we obtain the slowly rotating charge solutions from the Weyl double copy for the Kerr black hole with small Chern–Simons correction. Based on the Weyl double copy relation, for the Petrov type D solution in Chern–Simons modified gravity, we find the additional correction to the electromagnetic field strength tensor of the rotating charge. For the Petrov type I solution, we find that the additional electromagnetic field strength tensors have external sources, while the total sources vanish at the leading order.
Nonlocal coherence harvesting from quantum vacuum
Authors: Wang Rui-Di , Wu Shu-Min , Huang Xiao-Li 
Published: May 2024

Abstract
It is well known that nonlocal coherence reflects nonclassical correlations better than quantum entanglement. Here, we analyze nonlocal coherence harvesting from the quantum vacuum to particle detectors adiabatically interacting with a quantum scalar field in Minkowski spacetime. We find that the harvesting-achievable separation range of nonlocal coherence is larger than that of quantum entanglement. As the energy gap grows sufficiently large, the detectors harvest less quantum coherence, while the detectors could extract more quantum entanglement from the vacuum state. Compared with the linear configuration and the scalene configuration, we should choose the model of equilateral triangle configuration to harvest tripartite coherence from the vacuum. Finally, we find a monogamous relationship, which means that tripartite l1-norm of coherence is essentially bipartite types.
Magnetic domain structures in ultrathin Bi2Te3/CrTe2 heterostructures
Authors: Xia 夏 Tirui 体瑞 , Yang 杨 Xiaotian 笑天 , Zhang 张 Yifan 逸凡 , Liu 刘 Xinqi 馨琪 , Cai 蔡 Xinyu 新雨 , Liu 刘 Chang 畅 , Yao 姚 Qi 岐 , Kou 寇 Xufeng 煦丰 , Wang 王 Wenbo 文波 
Published: May 2024

Abstract
Chromium tellurium compounds are important two-dimensional van der Waals ferromagnetic materials with high Curie temperature and chemical stability in air, which is promising for applications in spintronic devices. Here, high-quality spin–orbital-torque (SOT) device, Bi2Te3/CrTe2 heterostructure was epitaxially grown on Al2O3 (0001) substrates. Anomalous Hall measurements indicate the existence of strong ferromagnetism in this device with the CrTe2 thickness down to 10 nm. In order to investigate its micromagnetic structure, cryogenic magnetic force microscope (MFM) was utilized to measure the magnetic domain evolutions at various temperatures and magnetic fields. The virgin domain state of the device shows a worm-like magnetic domain structure with the size around 0.6 μm–0.8 μm. Larger irregular-shape magnetic domains (> 1 μm) can be induced and pinned, after the field is increased to coercive field and ramped back to low fields. The temperature-dependent MFM signals exhibit a nice mean-field-like ferromagnetic transition with Curie temperature around 201.5 K, indicating a robust ferromagnetic ordering. Such a device can be potentially implemented in future magnetic memory technology.