中国物理B ›› 2021, Vol. 30 ›› Issue (10): 100305-100305.doi: 10.1088/1674-1056/abf346

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Fulde-Ferrell-Larkin-Ovchinnikov states in equally populated Fermi gases in a two-dimensional moving optical lattice

Jin-Ge Chen(陈金鸽)1, Yue-Ran Shi(石悦然)1, Ren Zhang(张仁)2, Kui-Yi Gao(高奎意)1,3,†, and Wei Zhang(张威)1,3,‡   

  1. 1 Department of Physics, Renmin University of China, Beijing 100872, China;
    2 School of Physics, Xi'an Jiaotong University, Xi'an 710049, China;
    3 Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China
  • 收稿日期:2021-03-03 修回日期:2021-03-23 接受日期:2021-03-30 出版日期:2021-09-17 发布日期:2021-09-30
  • 通讯作者: Kui-Yi Gao, Wei Zhang E-mail:kgao@ruc.edu.cn;wlzhang@ruc.edu.cn
  • 基金资助:
    Project supported by the Beijing Natural Science Foundation, China (Grant No. Z180013), the National Natural Science Foundation of China (Grant Nos. 11522436, 11774425, and 12074428), the National Key R&D Program of China (Grant No. 2018YFA0306501), and the Research Funds of Renmin University of China (Grant Nos. 16XNLQ03 and 18XNLQ15).

Fulde-Ferrell-Larkin-Ovchinnikov states in equally populated Fermi gases in a two-dimensional moving optical lattice

Jin-Ge Chen(陈金鸽)1, Yue-Ran Shi(石悦然)1, Ren Zhang(张仁)2, Kui-Yi Gao(高奎意)1,3,†, and Wei Zhang(张威)1,3,‡   

  1. 1 Department of Physics, Renmin University of China, Beijing 100872, China;
    2 School of Physics, Xi'an Jiaotong University, Xi'an 710049, China;
    3 Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China
  • Received:2021-03-03 Revised:2021-03-23 Accepted:2021-03-30 Online:2021-09-17 Published:2021-09-30
  • Contact: Kui-Yi Gao, Wei Zhang E-mail:kgao@ruc.edu.cn;wlzhang@ruc.edu.cn
  • Supported by:
    Project supported by the Beijing Natural Science Foundation, China (Grant No. Z180013), the National Natural Science Foundation of China (Grant Nos. 11522436, 11774425, and 12074428), the National Key R&D Program of China (Grant No. 2018YFA0306501), and the Research Funds of Renmin University of China (Grant Nos. 16XNLQ03 and 18XNLQ15).

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摘要： We study the possibility of stabilizing a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in an equally populated two-component Fermi gas trapped in a moving two-dimensional optical lattice. For a system with nearly half filling, we find that a finite pairing momentum perpendicular to the moving direction can be spontaneously induced for a proper choice of lattice velocity. As a result, the total pairing momentum is tilted towards the nesting vector to take advantage of the significant enhancement of the density of states.

关键词: FFLO state, optical lattice, ultracold Fermi gas, superfluid

Abstract: We study the possibility of stabilizing a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in an equally populated two-component Fermi gas trapped in a moving two-dimensional optical lattice. For a system with nearly half filling, we find that a finite pairing momentum perpendicular to the moving direction can be spontaneously induced for a proper choice of lattice velocity. As a result, the total pairing momentum is tilted towards the nesting vector to take advantage of the significant enhancement of the density of states.

Key words: FFLO state, optical lattice, ultracold Fermi gas, superfluid

中图分类号:  (Degenerate Fermi gases)

  • 03.75.Ss
03.75.Hh (Static properties of condensates; thermodynamical, statistical, and structural properties) 05.30.Fk (Fermion systems and electron gas)