中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5301-5307.doi: 10.1088/1674-1056/18/12/031

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Energy spectrum and superfluidity of spin-2 ultracold bosons in optical lattices

王永俊, 刘先锋, 韩玖荣   

  1. College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
  • 收稿日期:2009-02-26 修回日期:2009-03-18 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by National Natural Science Foundation of China (Grant No 10647144), Natural Science Foundation (Grant GK0513102) and Doctoral Special Fund of Yangzhou University.

Energy spectrum and superfluidity of spin-2 ultracold bosons in optical lattices

Wang Yong-Jun(王永俊), Liu Xian-Feng(刘先锋), and Han Jiu-Rong(韩玖荣)†   

  1. College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
  • Received:2009-02-26 Revised:2009-03-18 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by National Natural Science Foundation of China (Grant No 10647144), Natural Science Foundation (Grant GK0513102) and Doctoral Special Fund of Yangzhou University.

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摘要： This paper studies the superfluidity of ultracold spin-2 Bose atoms with weak interactions in optical lattices by calculating the excitation energy spectrum using the Bogoliubov approach. The energy spectra exhibit the characteristics of the superfluid-phase explicitly and it finds the nonvanishing critical speeds of superfluid. The obtained results display that the critical speeds of superfluid are different for five spin components and can be controlled by adjusting the lattice parameters in experiments. Finally it discusses the feasibilities of implementing and measuring superfluid.

Abstract: This paper studies the superfluidity of ultracold spin-2 Bose atoms with weak interactions in optical lattices by calculating the excitation energy spectrum using the Bogoliubov approach. The energy spectra exhibit the characteristics of the superfluid-phase explicitly and it finds the nonvanishing critical speeds of superfluid. The obtained results display that the critical speeds of superfluid are different for five spin components and can be controlled by adjusting the lattice parameters in experiments. Finally it discusses the feasibilities of implementing and measuring superfluid.

Key words: ultracold spin bosons, energy spectrum, superfluidity

中图分类号:  (Boson systems)

  • 05.30.Jp
37.10.De (Atom cooling methods) 37.10.Vz (Mechanical effects of light on atoms, molecules, and ions)