Quantum phase transition of condensed bosons in optical lattices

Details Quantum phase transition of condensed bosons in optical lattices Quantum phase transition of condensed bosons in optical lattices

2004-03-23

arxiv.org/abs/cond-mat/0403571v1

Phys. Rev. A 68, 043605 (2003)

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 1 figures

Scientific paper

10.1103/PhysRevA.68.043605

In this paper we study the superfluid-Mott-insulator phase transition of ultracold dilute gas of bosonic atoms in an optical lattice by means of Green function method and Bogliubov transformation as well. The superfluid- Mott-insulator phase transition condition is determined by the energy-band structure with an obvious interpretation of the transition mechanism. Moreover the superfluid phase is explained explicitly from the energy spectrum derived in terms of Bogliubov approach.

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