Enhancement of the thermal-transport figure of merit and breakdown of the Wiedemann-Franz law in unitary Fermi gases

被引：9
|
作者：
Han, Xinloong [1 ,2 ,3 ]
Liu, Boyang [4 ]
Hu, Jiangping [1 ,2 ,3 ,5 ]
机构：
[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Beijing Univ Technol, Inst Theoret Phys, Beijing 100124, Peoples R China
[5] Collaborat Innovat Ctr Quantum Matter, Beijing 100190, Peoples R China
来源：
PHYSICAL REVIEW A | 2019年 / 100卷 / 04期
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
IRREVERSIBLE-PROCESSES; RECIPROCAL RELATIONS; SPIN; SUPERFLUIDS; DYNAMICS;
D O I：
10.1103/PhysRevA.100.043604
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We theoretically investigate the thermal-transport properties of a unitary Fermi gas between two reservoirs connected by a quantum point contact. We find several distinguished properties that are qualitatively different from those of weak or noninteracting gas systems. The particle transport figure of merit is drastically enhanced in the unitary regime. The Lorentz number violates the Wiedemann-Franz law, demonstrating the breakdown of Fermi liquid. These transport properties are the hallmarks of the unitary Fermi gas and are attributed to the existence of preformed Cooper pairs. The variation of the thermal-transport coefficients due to the changing of the transmission coefficient is also studied.
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页数：5
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