Correlation properties of a one-dimensional repulsive Bose gas at finite temperature

Autor:	De Rosi, Giulia, Rota, Riccardo, Astrakharchik, Grigori E., Boronat, Jordi
Rok vydání:	2023
Předmět:	Condensed Matter - Quantum Gases Condensed Matter - Other Condensed Matter Condensed Matter - Strongly Correlated Electrons Physics - Atomic Physics Physics - Computational Physics
Zdroj:	New J. Phys. 25 043002 (2023)
Druh dokumentu:	Working Paper
DOI:	10.1088/1367-2630/acc6e6
Popis:	We present a comprehensive study shedding light on how thermal fluctuations affect correlations in a Bose gas with contact repulsive interactions in one spatial dimension. The pair correlation function, the static structure factor, and the one-body density matrix are calculated as a function of the interaction strength and temperature with the exact ab-initio Path Integral Monte Carlo method. We explore all possible gas regimes from weak to strong interactions and from low to high temperatures. We provide a detailed comparison with a number of theories, such as perturbative (Bogoliubov and decoherent classical), effective (Luttinger liquid) and exact (ground-state and thermal Bethe Ansatz) ones. Our Monte Carlo results exhibit an excellent agreement with the tractable limits and provide a fundamental benchmark for future observations which can be achieved in atomic gases, cavity quantum-electrodynamic and superconducting-circuit platforms. Comment: Main Text: 13 pages, 9 figures. Appendix: 1 page
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2301.07626 Zobrazit plný text záznamu View this record from Arxiv