Quantum Gases

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New submissions for Fri, 10 May 24

[1]  arXiv:2405.05287 [pdf, other]

Title: Characterizing Asymptotic Expansions of Quantum Fermi Gas

Authors: Jeremiah Birrell, Martin Formanek, Andrew Steinmetz, Cheng Tao Yang, Johann Rafelski

Comments: 31 pages 1+5 double figures

Subjects: Quantum Gases (cond-mat.quant-gas)

We characterize in a novel manner the physical properties of the low temperature Fermi gas in the degenerate domain as a function of temperature and chemical potential. For the first time we obtain low temperature $T$ results in the domain where several fermions are found within a de Broglie spatial cell. In this regime, the usual high degeneracy Sommerfeld expansion fails. The other known semi-classical Boltzmann domain applies when fewer than one particle is found in the de Broglie cell. The relative errors of the three approximate methods (Boltzmann limit, Sommerfeld expansion, and the new domain of several particles in the de Broglie cell) are quantified. In order to extend the understanding of the Sommerfeld expansion, we developed a novel characterization of the Fermi distribution allowing the separation of the finite and zero temperature phenomena.

Cross-lists for Fri, 10 May 24

[2]  arXiv:2405.05505 (cross-list from cond-mat.mes-hall) [pdf, other]

Title: Unveiling Higher-Order Topology via Polarized Topological Charges

Authors: Wei Jia, Bao-Zong Wang, Ming-Jian Gao, Jun-Hong An

Comments: 7+8 pages, 4+3 figures

Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Other Condensed Matter (cond-mat.other); Quantum Gases (cond-mat.quant-gas); Quantum Physics (quant-ph)

Real-space topological invariants were widely used to characterize chiral-symmetric higher-order topological phases (HOTPs). However, a momentum-space characterization to these HOTPs, which essentially reveals their intrinsic bulk-boundary correspondence and facilitates their detection in quantum simulation systems, is still lacking. Here, we propose an experimentally observable momentum-space characterization to the chiral-symmetric HOTPs by the concept of polarized topological charges. It makes a unified description to the HOTPs caused by the closing and reopening of band gap not only of the bulk states but also the edge states. Remarkably, these polarized topological charges can also be identified by measuring the pseudospin structures. A feasible scheme to detect the HOTPs in the $^{87}$Rb atomic system is given. Our work opens an avenue for characterization and experimental detection of the HOTPs in momentum space.

Replacements for Fri, 10 May 24

[3]  arXiv:2403.05528 (replaced) [pdf, other]

Title: Systematic analysis of relative phase extraction in one-dimensional Bose gases interferometry

Authors: Taufiq Murtadho, Marek Gluza, Khatee Zathul Arifa, Sebastian Erne, Jörg Schmiedmayer, Nelly H.Y. Ng

Comments: Significant updates from v1, contains new results section on the effect of image processing, 21+12 pages, 22 figures

Subjects: Quantum Gases (cond-mat.quant-gas); Quantum Physics (quant-ph)

[4]  arXiv:2308.01073 (replaced) [pdf, other]

Title: Many-Body Mobility Edge in Quantum Sun models

Authors: Konrad Pawlik, Piotr Sierant, Lev Vidmar, Jakub Zakrzewski

Comments: 4pp+suppl, version close to accepted in PRB Lett

Subjects: Disordered Systems and Neural Networks (cond-mat.dis-nn); Quantum Gases (cond-mat.quant-gas); Quantum Physics (quant-ph)

[5]  arXiv:2401.12695 (replaced) [pdf, other]

Title: Optical Snake States in Photonic Graphene

Authors: O.M. Bahrova, S.V. Koniakhin, A.V. Nalitov, E.D. Cherotchenko

Comments: 5+4 pages, 5+5 figures

Journal-ref: Opt. Lett. 49(10), 2581 (2024)

Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Gases (cond-mat.quant-gas); Optics (physics.optics)

[6]  arXiv:2405.04924 (replaced) [pdf, other]

Title: Comparison of two different integration methods for the (1+1)-Dimensional Schrödinger-Poisson Equation

Authors: Nico Schwersenz, Victor Loaiza, Tim Zimmermann, Javier Madroñero, Sandro Wimberger

Comments: Converged 1D solutions of Schr\"odinger-Poisson model including spatial expansion, comparison between various methods and optimisation of integrators

Journal-ref: Comp. Phys. Comm. 300, 109192 (2024)

Subjects: General Relativity and Quantum Cosmology (gr-qc); Quantum Gases (cond-mat.quant-gas); Computational Physics (physics.comp-ph)

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