Fate of Thermalization of Ultracold Fermions with Two-Body Dissipation

Physical Review Letters, Journal Year: 2025, Volume and Issue: 134(15)

Published: April 17, 2025

Two-body inelastic collisions arising from chemical reactions are prevalent in ultracold fermionic and bosonic molecular gases. Although recent advancements have achieved quantum degeneracy these systems, loss dynamics typically modeled phenomenologically using rate equations that often assume thermalization during reactions. In this study, we employ the Boltzmann equation to analyze particle loss, temperature evolution, momentum distributions single-component Fermi gases first principles. Our results demonstrate conventional particle-number accurately describes trapped systems but fails capture behavior homogeneous systems. Notably, under pure p-wave zero elastic collisions, find prepared near or above remain a thermal state, whereas initialized deep within exhibit nonequilibrium dynamics. theoretical predictions align well with experimental observations our claim can be further verified atomic induced two-body box potentials.

Language: Английский

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A type-II MoS2/GaN van der Waals heterostructure with tunable electronic and optical properties based on first principles

Materials Today Communications, Journal Year: 2025, Volume and Issue: 42, P. 111568 - 111568

Published: Jan. 1, 2025

Language: Английский

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Modeling Filamentary Conduction in Reset Phase Change Memory Devices

physica status solidi (RRL) - Rapid Research Letters, Journal Year: 2025, Volume and Issue: unknown

Published: March 2, 2025

A computational analysis is performed on percolation transport and filament formation in amorphous Ge 2 Sb Te 5 (a‐GST) using 2D finite element multiphysics simulations with nm out‐of‐plane depth an electric field temperature‐dependent electronic model carrier activation energies that vary locally around 0.3 eV as a function of temperature. The snapback (threshold switching) behavior the current–voltage ( I–V ) characteristics at ≈50 MV m −1 0.63 μA current for 300 K ambient temperature, where collapses onto single molten ≈2 diameter, aligned field, device switches from high‐resistance state (10 8 Ω) to low‐resistance 3 observed. Further increase voltage across leads widening filament. Snapback are strong functions ranging ≈0.53 200 ≈16.93 800 ≈85 150 45 350 K, respectively. decreases exponentially increasing length, converging ≈38 devices longer than nm.

Language: Английский

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Investigating the crust of neutron stars with neural-network quantum states

Communications Physics, Journal Year: 2025, Volume and Issue: 8(1)

Published: March 19, 2025

Language: Английский

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Beating spectral bandwidth limits for large aperture broadband nano-optics

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 28, 2025

Flat optics have been proposed as an attractive approach for the implementation of new imaging and sensing modalities to replace augment refractive optics. However, chromatic aberrations impose fundamental limitations on diffractive flat As such, true broadband high-quality has thus far out reach fast f-numbers, large aperture, In this work, we overcome intrinsic spectral bandwidth limitations, achieving in visible wavelength range with a meta-optic, co-designed computational reconstruction. We derive necessary conditions broadband, 1 cm f/2 optic, diagonal field view 30° average system MTF contrast 20% or larger spatial frequency 100 lp/mm band (>30% <70 lp/mm). Finally, use coaxial, dual-aperture train meta-optic learned reconstruction method operating pair-wise captured data. Fundamentally, our work challenges entrenched belief inability capturing high-quality, full-color images using single aperture meta-optic.

Language: Английский

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Large Rashba Spin Splitting in Janus WTeSe/InN Heterostructures Through Interfacial Coupling

physica status solidi (RRL) - Rapid Research Letters, Journal Year: 2025, Volume and Issue: unknown

Published: May 13, 2025

The manipulation of the Rashba effect in low‐dimensional systems is desirable for next generation spintronic devices. Herein, a novel strategy proposed to regulate spin splitting through interfacial interaction Janus WTeSe/InN heterostructures based on first‐principles calculations. Three kinds with different stacking interfaces are constructed, and dependence constant configurations atoms comprehensively investigated. maximum 1.55 eV Å −1 achieved WTeSe/N‐terminated InN heterostructure, representing 193% enhancement compared pristine WTeSe (0.53 ). It found that enhanced related not only net electric field but also interface elements (or coupling). Furthermore, heterostructure regulated by interlayer distances an external field. constants increase 1.95 1.74 at spacing 2.1 under applied −0.3 V , respectively, showing increases 26% 12%. This work paves way modify 2D semiconductors.

Language: Английский

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Revolutionizing ORR catalyst design through computational methodologies and materials informatics

EES Catalysis, Journal Year: 2024, Volume and Issue: 2(5), P. 1037 - 1058

Published: Jan. 1, 2024

The combination of density functional theory (DFT), machine learning, descriptor-based analysis, and computational hydrogen electrode is pivotal in discovering novel classed active catalysts for oxygen reduction reaction (ORR).

Language: Английский

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Influence of Selective Carbon 1s Excitation on Auger–Meitner Decay in the ESCA Molecule

The Journal of Physical Chemistry Letters, Journal Year: 2024, Volume and Issue: 15(16), P. 4286 - 4293

Published: April 12, 2024

Two-dimensional spectral mapping is used to visualize how resonant Auger-Meitner spectra are influenced by the site of initial core-electron excitation and symmetry core-excited state in trifluoroethyl acetate molecule (ESCA). We observe a significant enhancement electron yield for COO 1s → π* CF3 σ* resonances unlike at involving CH3 CH2 sites. The resonance very different from each other, with latter populating most valence states equally. Two complementary electronic structure calculations photoelectron cross section intensity shown effectively reproduce site- state-selective nature features. respective final hole locality increase sensistivity signal specific functional group This showcases decay as potentially powerful tool selectively probing structural changes sites polyatomic molecules.

Language: Английский

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Observation of molecular resonant double-core excitation driven by intense X-ray pulses

Communications Physics, Journal Year: 2024, Volume and Issue: 7(1)

Published: Oct. 17, 2024

Abstract The ultrashort and intense pulses of X-rays produced at X-ray free electron lasers (XFELs) have enabled unique experiments on the atomic level structure dynamics matter, with time-resolved studies permitted in femto- attosecond regimes. To fully exploit them, it is paramount to obtain a comprehensive understanding complex nonlinear interactions that can occur such extreme intensities. Herein, we report experimental observation resonant double-core excitation scheme N 2 , where two 1 σ core-level electrons are resonantly promoted unoccupied $$1{\pi }_{g}^{* }$$ 1 π g * molecular orbitals by single few-femtosecond broad-bandwidth XFEL pulse. production these neutral two-site double core hole states evidenced through their characteristic decay channels, which observed good agreement high-level theoretical calculations. Such multi-core schemes, benefiting from high interaction cross sections state- site-selective nature interactions, should be generally accessible irradiated molecules, provide interesting opportunities for chemical analysis monitoring ultrafast dynamic processes.

Language: Английский

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Tracking conical intersection passage with time-resolved resonant Auger scattering

Physical review. A/Physical review, A, Journal Year: 2024, Volume and Issue: 110(4)

Published: Oct. 10, 2024

Language: Английский

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