Spin-orbit coupling adjusting topological superfluid of mass-imbalanced Fermi gas

doi:10.1088/1674-1056/ac6860

中国物理B ›› 2022, Vol. 31 ›› Issue (9): 90305-090305.doi: 10.1088/1674-1056/ac6860

Spin-orbit coupling adjusting topological superfluid of mass-imbalanced Fermi gas

Jian Feng(冯鉴)¹, Wei-Wei Zhang(张伟伟)¹, Liang-Wei Lin(林良伟)¹, Qi-Peng Cai(蔡启鹏)¹, Yi-Cai Zhang(张义财)², Sheng-Can Ma(马胜灿)¹, and Chao-Fei Liu(刘超飞)^1,†

1 School of Science, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2 School of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, China

收稿日期:2021-12-20 修回日期:2022-03-21 接受日期:2022-04-20 出版日期:2022-08-19 发布日期:2022-09-03
通讯作者: Chao-Fei Liu E-mail:liuchaofei@jxust.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11875149, 11874127, 52061014, and 61565007), the Youth Jing-gang Scholars Program of Jiangxi Province, China and the Program of Qing-jiang Excellent Young Talents, Jiangxi University of Science and Technology.

Spin-orbit coupling adjusting topological superfluid of mass-imbalanced Fermi gas

Jian Feng(冯鉴)¹, Wei-Wei Zhang(张伟伟)¹, Liang-Wei Lin(林良伟)¹, Qi-Peng Cai(蔡启鹏)¹, Yi-Cai Zhang(张义财)², Sheng-Can Ma(马胜灿)¹, and Chao-Fei Liu(刘超飞)^1,†

1 School of Science, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2 School of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, China

Received:2021-12-20 Revised:2022-03-21 Accepted:2022-04-20 Online:2022-08-19 Published:2022-09-03
Contact: Chao-Fei Liu E-mail:liuchaofei@jxust.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11875149, 11874127, 52061014, and 61565007), the Youth Jing-gang Scholars Program of Jiangxi Province, China and the Program of Qing-jiang Excellent Young Talents, Jiangxi University of Science and Technology.

摘要/Abstract

摘要： Topological superfluid state is different from the normal superfluid one due to the excitation energy gap on the boundary. How to obtain the topological superfluid state by using spin-orbit coupling to control the s-waves paired mass-imbalanced Fermi gas is a recent novel topic. In this paper, we study the topological superfluid phase diagram of two-dimensional mass-imbalanced Fermi gas with Rashba spin-orbit coupling at zero temperature. We find that due to the competition among mass imbalance, pairing interaction and spin-orbit coupling, there is a double-well structure in the thermodynamic potential, which affects the properties of the ground state of the system. We comprehensively give the phase diagrams of the system on the plane of spin-orbit coupling and chemical potential, and the phase diagrams on the plane of the reduced mass ratio and two-body binding energy. This study not only points out the stable region of topological superfluid state of mass-imbalanced Fermi gas, but also provides a detailed theoretical basis for better observation of topological superfluid state in experiments.

关键词: topological superfluid, mass-imbalanced, spin-orbit coupling, Fermi gas

Abstract: Topological superfluid state is different from the normal superfluid one due to the excitation energy gap on the boundary. How to obtain the topological superfluid state by using spin-orbit coupling to control the s-waves paired mass-imbalanced Fermi gas is a recent novel topic. In this paper, we study the topological superfluid phase diagram of two-dimensional mass-imbalanced Fermi gas with Rashba spin-orbit coupling at zero temperature. We find that due to the competition among mass imbalance, pairing interaction and spin-orbit coupling, there is a double-well structure in the thermodynamic potential, which affects the properties of the ground state of the system. We comprehensively give the phase diagrams of the system on the plane of spin-orbit coupling and chemical potential, and the phase diagrams on the plane of the reduced mass ratio and two-body binding energy. This study not only points out the stable region of topological superfluid state of mass-imbalanced Fermi gas, but also provides a detailed theoretical basis for better observation of topological superfluid state in experiments.

Key words: topological superfluid, mass-imbalanced, spin-orbit coupling, Fermi gas

中图分类号: (Degenerate Fermi gases)

03.75.Ss

03.75.Hh (Static properties of condensates; thermodynamical, statistical, and structural properties) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

Jian Feng(冯鉴), Wei-Wei Zhang(张伟伟), Liang-Wei Lin(林良伟), Qi-Peng Cai(蔡启鹏), Yi-Cai Zhang(张义财), Sheng-Can Ma(马胜灿), and Chao-Fei Liu(刘超飞). Spin-orbit coupling adjusting topological superfluid of mass-imbalanced Fermi gas[J]. 中国物理B, 2022, 31(9): 90305-090305.

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Spin-orbit coupling adjusting topological superfluid of mass-imbalanced Fermi gas

Spin-orbit coupling adjusting topological superfluid of mass-imbalanced Fermi gas

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