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《Low Temperature Physical Letters》 2018-05
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Superfluidity of Fermi Gas in Modulation Defect Lattice

JIAN Yue;ZHEN Xiaopin;ZHANG Peizeng;QI Pengtang;LI Wei;Department of Basic Courses,Lanzhou Institute of Technology;Lanzhou City University;College of physics and Electronic Engineering,Northwest Normal University;  
We study the superfluidity of Fermi gas in a modulated one-dimensional annular optical lattice.Under the hydrodynamic scheme and two-mode ansatz,the dynamics of the system map on a nonrigid pendulum Hamiltonian,and the critical conditionρcfor the superfluous phase transition in the system can be obtained.There exists a critical atomic density along the entire BEC-BCS crossover and cause the system to have another state in addition to the normal state of defects induced damping,that is,the superfluid regime with the plane wave continuously passes through defects.The superfluidity of the system depends on the strength and type of the defects and the atomic interaction.Due to the coupling of the defects and the atomic interaction,the system can easily maintain the superfluid state on the BCS side.
【Fund】: 甘肃省自然科学基金(批准号:18JR3RA230);; 甘肃省高等学校科研项目(批准号:2018D-19);; 兰州市人才创新创业项目(批准号:114);; 兰州工业学院“开物”科研创新团队支持计划资助(编号:2018KW-06)、兰州工业学院青年科技创新项目(编号:17K-018)
【CateGory Index】: O469
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