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

作　　者：Jian Feng Wei-Wei Zhang Liang-Wei Lin Qi-Peng Cai Yi-Cai Zhang Sheng-Can Ma Chao-Fei Liu 冯鉴;张伟伟;林良伟;蔡启鹏;张义财;马胜灿;刘超飞(School of Science,Jiangxi University of Science and Technology,Ganzhou 341000,China;School of Physics and Electronic Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[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

出　　处：《Chinese Physics B》2022年第9期208-216,共9页中国物理B（英文版）

基　　金：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;the Program of Qing-jiang Excellent Young Talents, Jiangxi University of Science and Technology

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 topolog-ical 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 

分 类 号：O469[理学—凝聚态物理]