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

Abstract 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...

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Autores principales:	Hang Zhou, Yongli Ma
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3d27b0ebe2464872a9cd2a9125f41fee
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spelling	oai:doaj.org-article:3d27b0ebe2464872a9cd2a9125f41fee2021-12-02T15:23:02ZThermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover10.1038/s41598-020-79010-w2045-2322https://doaj.org/article/3d27b0ebe2464872a9cd2a9125f41fee2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79010-whttps://doaj.org/toc/2045-2322Abstract 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 $$T_c$$ T c in the BCS-BEC crossover, we present a Kubo-based microscopic calculation of thermal conductivity $$\kappa$$ κ , 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. $$\kappa$$ κ drops upon crossing the pseudogap temperature $$T^$$ T ∗ , and its temperature dependence changes below $$T_c$$ T c . The drops become more pronounced on the weakly coupled BCS side, where the Pauli blocking causes the upturn of $$\kappa$$ κ above $$T^$$ T ∗ . Our calculations fit well with the sound measurement on the damping rate.Hang ZhouYongli MaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hang Zhou Yongli Ma Thermal conductivity of an ultracold Fermi gas in the BCS-BEC crossover
description	Abstract 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 $$T_c$$ T c in the BCS-BEC crossover, we present a Kubo-based microscopic calculation of thermal conductivity $$\kappa$$ κ , 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. $$\kappa$$ κ drops upon crossing the pseudogap temperature $$T^$$ T ∗ , and its temperature dependence changes below $$T_c$$ T c . The drops become more pronounced on the weakly coupled BCS side, where the Pauli blocking causes the upturn of $$\kappa$$ κ above $$T^$$ T ∗ . Our calculations fit well with the sound measurement on the damping rate.
format	article
author	Hang Zhou Yongli Ma
author_facet	Hang Zhou Yongli Ma
author_sort	Hang Zhou
title	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_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_sort	thermal conductivity of an ultracold fermi gas in the bcs-bec crossover
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3d27b0ebe2464872a9cd2a9125f41fee
work_keys_str_mv	AT hangzhou thermalconductivityofanultracoldfermigasinthebcsbeccrossover AT yonglima thermalconductivityofanultracoldfermigasinthebcsbeccrossover
_version_	1718387319535304704

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

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