Condensation of Fermions in the double-well potential

doi:10.1088/1674-1056/23/2/026701

Abstract The density distribution of ultracold two-component fermionic gases ⁶Li, which are confined in a gradient magnetic field and a symmetrical double-well potential, is investigated by employing local-density approximation. It is found that three different regimes including quasi-molecular Bose–Einstein condensation (BEC_m), the dimers in the unitarity limit (UL_d), and Bardeen–Cooper–Schrieffer superfluid (BCS) can coexist at the same time. Furthermore, the ranges of these regimes can be controlled to some extent by tuning the gradient of the magnetic field and the parameters characterizing the properties of the double-well potential. This study is of guidance and significance for experimentally realizing the coexistence of BEC_m, UL_d, and BCS in the double-well potential.

Keywords: molecular Bose–Einstein condensation unitarity limit Bardeen–Cooper–Schrieffer superfluid

Received: 22 April 2013
Revised: 11 June 2013
Accepted manuscript online:

PACS:	67.10.Db	(Fermion degeneracy)
	67.85.Lm	(Degenerate Fermi gases)
	03.75.Ss	(Degenerate Fermi gases)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11275112), the Natural Science Foundation of Shandong Province of China (Grant No. ZR2011AM018), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20103705110004).

Corresponding Authors: Kong Xiang-Mu
E-mail: kongxm@mail.qfnu.edu.cn

About author: 67.10.Db; 67.85.Lm; 03.75.Ss

Cite this article:

Chen Xin-Wei (陈欣委), Liu Zhong-Qiang (刘中强), Kong Xiang-Mu (孔祥木) Condensation of Fermions in the double-well potential 2014 Chin. Phys. B 23 026701

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