Shear viscosity of an ultracold Fermi gas in the BCS-BEC crossover

doi:10.1088/1674-1056/adc403

中国物理B ›› 2025, Vol. 34 ›› Issue (5): 53103-053103.doi: 10.1088/1674-1056/adc403

Shear viscosity of an ultracold Fermi gas in the BCS-BEC crossover

Jing Min(闵靖)^1,2, Xiangchuan Yan(严祥传)¹, Da-Li Sun(孙大立)^1,†, Lu Wang(王璐)^1,2, Xin Xie(谢馨)^1,2, Xizhi Wu(吴熙至)^1,2, Shi-Guo Peng(彭世国)¹, and Kaijun Jiang(江开军)^1,3,‡

1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Wuhan Institute of Quantum Technology, Wuhan 430206, China

收稿日期:2024-12-31 修回日期:2025-03-21 接受日期:2025-03-24 出版日期:2025-04-18 发布日期:2025-05-06
通讯作者: Da-Li Sun, Kaijun Jiang E-mail:dlsun@wipm.ac.cn;kjjiang@wipm.ac.cn
基金资助:
Project supported by the National Key R&D Program (Grant No. 2022YFA1404102), the National Natural Science Foundation of China (Grant Nos. U23A2073, 12374250, and 12121004), Chinese Academy of Sciences (Grant No. YJKYYQ20170025), and Hubei Province (Grant No. 2021CFA027).

Shear viscosity of an ultracold Fermi gas in the BCS-BEC crossover

1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Wuhan Institute of Quantum Technology, Wuhan 430206, China

Received:2024-12-31 Revised:2025-03-21 Accepted:2025-03-24 Online:2025-04-18 Published:2025-05-06
Contact: Da-Li Sun, Kaijun Jiang E-mail:dlsun@wipm.ac.cn;kjjiang@wipm.ac.cn
Supported by:
Project supported by the National Key R&D Program (Grant No. 2022YFA1404102), the National Natural Science Foundation of China (Grant Nos. U23A2073, 12374250, and 12121004), Chinese Academy of Sciences (Grant No. YJKYYQ20170025), and Hubei Province (Grant No. 2021CFA027).

摘要/Abstract

摘要： We report on the measurement of shear viscosity in an ultracold Fermi gas with variable temperatures and tunable interactions. A quadrupole mode excitation in an isotropic harmonic trap is used to quantify the shear viscosity of the quantum gas within the hydrodynamic regime. The shear viscosity of the system as a function of temperature has been investigated, and the results closely align with calculations in the high-temperature limit utilizing a new definition of the cutoff radius. Through an adiabatic sweep across the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) crossover, we find that the minimum value of the shear viscosity, as a function of interaction strength, is significantly shifted toward the BEC side. Furthermore, the behavior of the shear viscosity is asymmetric on both sides of the location of the minimum.

关键词: shear viscosity, quadrupole mode, hydrodynamic theory, BCS-BEC crossover

Abstract: We report on the measurement of shear viscosity in an ultracold Fermi gas with variable temperatures and tunable interactions. A quadrupole mode excitation in an isotropic harmonic trap is used to quantify the shear viscosity of the quantum gas within the hydrodynamic regime. The shear viscosity of the system as a function of temperature has been investigated, and the results closely align with calculations in the high-temperature limit utilizing a new definition of the cutoff radius. Through an adiabatic sweep across the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) crossover, we find that the minimum value of the shear viscosity, as a function of interaction strength, is significantly shifted toward the BEC side. Furthermore, the behavior of the shear viscosity is asymmetric on both sides of the location of the minimum.

Key words: shear viscosity, quadrupole mode, hydrodynamic theory, BCS-BEC crossover

中图分类号: (Time-dependent phenomena: excitation and relaxation processes, and reaction rates)

31.70.Hq

37.10.Jk (Atoms in optical lattices)

Jing Min(闵靖), Xiangchuan Yan(严祥传), Da-Li Sun(孙大立), Lu Wang(王璐), Xin Xie(谢馨), Xizhi Wu(吴熙至), Shi-Guo Peng(彭世国), and Kaijun Jiang(江开军). Shear viscosity of an ultracold Fermi gas in the BCS-BEC crossover[J]. 中国物理B, 2025, 34(5): 53103-053103.

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Shear viscosity of an ultracold Fermi gas in the BCS-BEC crossover

Shear viscosity of an ultracold Fermi gas in the BCS-BEC crossover

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