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.
Received: 26 February 2009
Revised: 18 March 2009
Accepted manuscript online:
(Mechanical effects of light on atoms, molecules, and ions)
Fund: Project supported by National
Natural Science Foundation of China (Grant No 10647144), Natural
Science Foundation (Grant GK0513102) and Doctoral Special Fund of
Yangzhou University.
Cite this article:
Wang Yong-Jun(王永俊), Liu Xian-Feng(刘先锋), and Han Jiu-Rong(韩玖荣) Energy spectrum and superfluidity of spin-2 ultracold bosons in optical lattices 2009 Chin. Phys. B 18 5301
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