One-dimensional phase transitions in a two-dimensional optical lattice
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- 作者：M. Rehn ; S. Bergkvist ; A. Rosengren ; R. Saers ; M. Zel¨¢n ; E. Lundh and A. Kastberg
- 关键词：PACS 05.30.Jp Boson systems ; 03.75.Lm Tunneling ; Josephson effect ; Bose ; Einstein condensates in periodic potentials ; solitons ; vortices ; and topological excitations ; 67.90.+z Other topics in quantum fluids and solids
- 刊名：The European Physical Journal D - Atomic, Molecular and Optical Physics
- 出版年：2008
- 出版时间：September, 2008
- 年：2008
- 卷：49
- 期：2
- 页码：223-230
- 全文大小：316.3 KB
文摘
A phase transition for bosonic atoms in a two-dimensional anisotropic optical lattice is considered. If the tunnelling rates in two directions are different, the system can undergo a transition between a two-dimensional superfluid and a one-dimensional Mott insulating array of strongly coupled tubes. The connection to other lattice models is exploited in order to better understand the phase transition. Critical properties are obtained using quantum Monte Carlo calculations. These critical properties are related to correlation properties of the bosons and a criterion for commensurate filling is established.