Energy spectrum of fermionized bosonic atoms in optical lattices

We investigate the energy spectrum of fermionized bosonic atoms, which behave very much like spinless noninteracting fermions, in optical lattices by means of the perturbation expansion and the retarded Green's function method. The results show that the energy spectrum splits into two energy bands with single-occupation; the fermionized bosonic atom occupies nonvanishing energy state and left hole has a vanishing energy at any given momentum, and the system is in Mott-insulating state with a energy gap.Using the characteristic of energy spectra we obtained a criterion with which one can judge whether the Tonks-Girardeau (TG) gas is achieved or not.

作 者： Jiurong Han Haichao Zhang Yuzhu Wang   作者单位： Jiurong Han(Department of Physics, Yangzhou University, Yangzhou 225002;Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics;Center for Cold Atom Physics, Chinese Academy of Sciences, Shanghai 201800)

Haichao Zhang,Yuzhu Wang(Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics;Center for Cold Atom Physics, Chinese Academy of Sciences, Shanghai 201800) 

刊 名： 中国光学快报（英文版）  EI SCI 英文刊名： CHINESE OPTICS LETTERS  年，卷(期)： 2005 3(11)  分类号：   关键词：  

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