Tunneling dynamics of superfluid Fermi gas in a triple-well potential

doi:10.1088/1674-1056/22/8/080307

中国物理B ›› 2013, Vol. 22 ›› Issue (8): 80307-080307.doi: 10.1088/1674-1056/22/8/080307

Tunneling dynamics of superfluid Fermi gas in a triple-well potential

苟学强, 蒙红娟, 王文元, 段文山

College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

收稿日期:2012-11-17 修回日期:2013-01-21 出版日期:2013-06-27 发布日期:2013-06-27
基金资助:
Project supported by the National Fundamental Research Program of China (Grant Nos. 2007CB814800 and 2011CB921503), the National Natural Science Foundation of China (Grant Nos. 11275156, 91021021, and 10875098), and the Natural Science Foundation of Northwest Normal University (Grant No. NWNU-KJCXGC-03-48).

Tunneling dynamics of superfluid Fermi gas in a triple-well potential

Gou Xue-Qiang (苟学强), Meng Hong-Juan (蒙红娟), Wang Wen-Yuan (王文元), Duan Wen-Shan (段文山)

College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

Received:2012-11-17 Revised:2013-01-21 Online:2013-06-27 Published:2013-06-27
Contact: Duan Wen-Shan E-mail:duanws@nwnu.edu.cn
Supported by:
Project supported by the National Fundamental Research Program of China (Grant Nos. 2007CB814800 and 2011CB921503), the National Natural Science Foundation of China (Grant Nos. 11275156, 91021021, and 10875098), and the Natural Science Foundation of Northwest Normal University (Grant No. NWNU-KJCXGC-03-48).

摘要/Abstract

摘要： The tunneling dynamics of superfluid Fermi gas in a triple-well potential in the unitarity regime is investigated in the present paper. The fixed points of the (0,0) mode and the (π,π) mode are given. We find that the interaction parameter U and the coupling strength k could have an extreme effect on the quantum tunneling dynamics. We also find that, in the zero mode, only Josophson oscillation appears. However, for the π mode, the trapping phenomena take place. An irregular oscillation of the particle number in each well could appear by adjusting the scanning period T. It is noted that if the scanning period is less than a critical point T^*, the particle number will come back to the fixed point with small oscillation, while if T >T^* the particle number cannot come back to the fixed point, but with irregular oscillations. The dependence of the critical point T^* on the system parameter of coupling strength k is numerically given.

关键词: Fermi superfluid gas, fixed points, unitarity regime, triple wells

Abstract: The tunneling dynamics of superfluid Fermi gas in a triple-well potential in the unitarity regime is investigated in the present paper. The fixed points of the (0,0) mode and the (π,π) mode are given. We find that the interaction parameter U and the coupling strength k could have an extreme effect on the quantum tunneling dynamics. We also find that, in the zero mode, only Josophson oscillation appears. However, for the π mode, the trapping phenomena take place. An irregular oscillation of the particle number in each well could appear by adjusting the scanning period T. It is noted that if the scanning period is less than a critical point T^*, the particle number will come back to the fixed point with small oscillation, while if T >T^* the particle number cannot come back to the fixed point, but with irregular oscillations. The dependence of the critical point T^* on the system parameter of coupling strength k is numerically given.

Key words: Fermi superfluid gas, fixed points, unitarity regime, triple wells

中图分类号: (Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)

03.75.Kk

03.75.Lm (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations) 37.10.Jk (Atoms in optical lattices)

苟学强, 蒙红娟, 王文元, 段文山. Tunneling dynamics of superfluid Fermi gas in a triple-well potential[J]. 中国物理B, 2013, 22(8): 80307-080307.

Gou Xue-Qiang (苟学强), Meng Hong-Juan (蒙红娟), Wang Wen-Yuan (王文元), Duan Wen-Shan (段文山). Tunneling dynamics of superfluid Fermi gas in a triple-well potential[J]. Chin. Phys. B, 2013, 22(8): 80307-080307.

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Tunneling dynamics of superfluid Fermi gas in a triple-well potential

Tunneling dynamics of superfluid Fermi gas in a triple-well potential

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