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Thermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover

Recent experiments on sound waves in a unitary Fermi gas reveal many transport properties about strongly interacting fermions. Sound propagates through the coupling of momentum and heat transport, and attenuates strongly with the presence of a phase transition. In this work, focusing on the temperat...

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Autores principales: Zhou, Hang, Ma, Yongli
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7806942/
https://www.ncbi.nlm.nih.gov/pubmed/33441608
http://dx.doi.org/10.1038/s41598-020-79010-w
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author Zhou, Hang
Ma, Yongli
author_facet Zhou, Hang
Ma, Yongli
author_sort Zhou, Hang
collection PubMed
description Recent experiments on sound waves in a unitary Fermi gas reveal many transport properties about strongly interacting fermions. Sound propagates through the coupling of momentum and heat transport, and attenuates strongly with the presence of a phase transition. In this work, focusing on the temperature regimes near and below the superfluid critical temperature [Formula: see text] in the BCS-BEC crossover, we present a Kubo-based microscopic calculation of thermal conductivity [Formula: see text] , which has not attracted much attention compared to the shear viscosity. Our approach primarily addresses the contributions of the fermionic quasiparticles to thermal transport and our results return to the kinetic descriptions at high temperatures. [Formula: see text] drops upon crossing the pseudogap temperature [Formula: see text] , and its temperature dependence changes below [Formula: see text] . The drops become more pronounced on the weakly coupled BCS side, where the Pauli blocking causes the upturn of [Formula: see text] above [Formula: see text] . Our calculations fit well with the sound measurement on the damping rate.
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spelling pubmed-78069422021-01-14 Thermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover Zhou, Hang Ma, Yongli Sci Rep Article Recent experiments on sound waves in a unitary Fermi gas reveal many transport properties about strongly interacting fermions. Sound propagates through the coupling of momentum and heat transport, and attenuates strongly with the presence of a phase transition. In this work, focusing on the temperature regimes near and below the superfluid critical temperature [Formula: see text] in the BCS-BEC crossover, we present a Kubo-based microscopic calculation of thermal conductivity [Formula: see text] , which has not attracted much attention compared to the shear viscosity. Our approach primarily addresses the contributions of the fermionic quasiparticles to thermal transport and our results return to the kinetic descriptions at high temperatures. [Formula: see text] drops upon crossing the pseudogap temperature [Formula: see text] , and its temperature dependence changes below [Formula: see text] . The drops become more pronounced on the weakly coupled BCS side, where the Pauli blocking causes the upturn of [Formula: see text] above [Formula: see text] . Our calculations fit well with the sound measurement on the damping rate. Nature Publishing Group UK 2021-01-13 /pmc/articles/PMC7806942/ /pubmed/33441608 http://dx.doi.org/10.1038/s41598-020-79010-w Text en © The Author(s) 2021 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Zhou, Hang
Ma, Yongli
Thermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover
title Thermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover
title_full Thermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover
title_fullStr Thermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover
title_full_unstemmed Thermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover
title_short Thermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover
title_sort thermal conductivity of an ultracold fermi gas in the bcs-bec crossover
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7806942/
https://www.ncbi.nlm.nih.gov/pubmed/33441608
http://dx.doi.org/10.1038/s41598-020-79010-w
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