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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 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 |
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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.
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Received: 03 March 2021
Revised: 23 March 2021
Accepted manuscript online: 30 March 2021
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PACS:
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03.75.Ss
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(Degenerate Fermi gases)
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03.75.Hh
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(Static properties of condensates; thermodynamical, statistical, and structural properties)
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05.30.Fk
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(Fermion systems and electron gas)
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| Fund: 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). |
Corresponding Authors:
Kui-Yi Gao, Wei Zhang
E-mail: kgao@ruc.edu.cn;wlzhang@ruc.edu.cn
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Cite this article:
Jin-Ge Chen(陈金鸽), Yue-Ran Shi(石悦然), Ren Zhang(张仁), Kui-Yi Gao(高奎意), and Wei Zhang(张威) Fulde-Ferrell-Larkin-Ovchinnikov states in equally populated Fermi gases in a two-dimensional moving optical lattice 2021 Chin. Phys. B 30 100305
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