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ENERGY SPECTRUM AND SUPERFLUID-MOTT INSULATOR PHASE TRANSITION OF ULTRACOLD BOSONS IN OPTICAL LATTICE

JUN-JUN LIANG

Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China

Corresponding author.

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J.-Q. LIANG

Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China

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, and

W.-M. LIU

Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P. O. Box 2101, Beijing 100088, China

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https://doi.org/10.1142/S0217979203022805Cited by:0 (Source: Crossref)

Abstract

Green function metheod is introduced to investigate ultracold dilute gas of bosonic atoms in an optical lattice which can be described by a Bose–Hubbard model. The superfluid–Mott insulator phase transition condition is determined by the related energy-band structure with an obvious interpretation of the transition mechanism.

Keywords:

PACS: 03.75.Fi, 67.40.-w, 32.80.Pj, 39.25.+k

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