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
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.
Fund: 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).
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 2025 Chin. Phys. B 34 053103
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