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Topological superfluid in a two-dimensional polarized Fermi gas with spin-orbit coupling and adiabatic rotation |
| Lei Qiao(乔雷)1,2, Cheng Chi(迟诚)1,2 |
1. School of Physics, Peking University, Beijing 100871, China;
2. Collaborative Innovation Center of Quantum Matter, Beijing 100871, China |
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Abstract We study the properties of superfluid in a two-dimensional (2D) polarized Fermi gas with spin-orbit coupling and adiabatic rotation which are trapped in a harmonic potential. Due to the competition between polarization, spin-orbit coupling, and adiabatic rotation, the Fermi gas exhibits many intriguing phenomena. By using the Bardeen-Cooper-Schrieffer (BCS) mean-field method with local density approximation, we investigate the dependence of order parameter solution on the spin-orbit coupling strength and the rotation velocity. The energy spectra with different rotation velocities are studied in detail. Besides, the conditions for the zero-energy Majorana fermions in topological superfluid phase to be observed are obtained. By investigating distributions of number density, we find that the rotation has opposite effect on the distribution of number density with different spins, which leads to the enhancement of the polarization of Fermi gas. Here, we focus on the region of BCS pairing and ignore the Fulde-Ferrell-Larkin-Ovchinnikov state.
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Received: 27 May 2017
Revised: 15 September 2017
Accepted manuscript online:
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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.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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67.85.Lm
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(Degenerate Fermi gases)
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Corresponding Authors:
Lei Qiao
E-mail: leiqiao@pku.edu.cn
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Cite this article:
Lei Qiao(乔雷), Cheng Chi(迟诚) Topological superfluid in a two-dimensional polarized Fermi gas with spin-orbit coupling and adiabatic rotation 2017 Chin. Phys. B 26 120304
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