中国物理B ›› 2015, Vol. 24 ›› Issue (7): 76701-076701.doi: 10.1088/1674-1056/24/7/076701

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Phase diagram and collective modes in Rashba spin–orbit coupled BEC: Effect of in-plane magnetic field

董冬, 邹旭波, 郭光灿   

  1. Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2015-03-08 修回日期:2015-04-14 出版日期:2015-07-05 发布日期:2015-07-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 10774088).

Phase diagram and collective modes in Rashba spin–orbit coupled BEC: Effect of in-plane magnetic field

Dong Dong (董冬), Zou Xu-Bo (邹旭波), Guo Guang-Can (郭光灿)   

  1. Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • Received:2015-03-08 Revised:2015-04-14 Online:2015-07-05 Published:2015-07-05
  • Contact: Zou Xu-Bo E-mail:xbz@ustc.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 10774088).

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摘要：

We studied the system of pure Rashba spin–orbit coupled Bose gas with an in-plane magnetic field. Based on the mean field theory, we obtained the zero temperature phase diagram of the system which exhibits three phases, plane wave (PW) phase, striped wave (SW) phase, and zero momentum (ZM) phase. It was shown that with a growing in-plane field, both SW and ZM phases will eventually turn into the PW phase. Furthermore, we adopted the Bogoliubov theory to study the excitation spectrum as well as the sound speed.

关键词: Rashba spin-orbit coupling, excitation spectrum, in-plane magnetic field

Abstract:

We studied the system of pure Rashba spin–orbit coupled Bose gas with an in-plane magnetic field. Based on the mean field theory, we obtained the zero temperature phase diagram of the system which exhibits three phases, plane wave (PW) phase, striped wave (SW) phase, and zero momentum (ZM) phase. It was shown that with a growing in-plane field, both SW and ZM phases will eventually turn into the PW phase. Furthermore, we adopted the Bogoliubov theory to study the excitation spectrum as well as the sound speed.

Key words: Rashba spin-orbit coupling, excitation spectrum, in-plane magnetic field

中图分类号:  (Multicomponent condensates; spinor condensates)

  • 67.85.Fg
05.30.Jp (Boson systems) 03.75.Mn (Multicomponent condensates; spinor condensates)