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arXiv 0902.1625cond-mat.other
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各向异性二维光晶格中超流到莫特绝缘体的转变

Superfluid to Mott-insulator transition in an anizotropic two--dimensional optical lattice

T. P. Polak, T. K. Kopec

摘要:

本文采用具有各向异性参数$κ$的二维晶格上的玻色-哈伯德模型,研究了光学各向异性晶格中玻色子的超流到莫特绝缘体的转变.利用量子U(1)转子方法,有效地解析描述了可压缩超流态和不可压缩莫特绝缘体(MI)波瓣。基态相图显示MI叶的演变是量化的任意值的$κ$,对应于各种晶格:从正方形,通过矩形几乎一维。

英文摘要:

We study the superfluid to Mott-insulator transition of bosons in an optical anizotropic lattice by employing the Bose-Hubbard model living on a two-dimensional lattice with anizotropy parameter $κ$. The compressible superfluid state and incompressible Mott-insulator (MI) lobes are efficiently described analytically, using the quantum U(1) rotor approach. The ground state phase diagram showing the evolution of the MI lobes is quantified for arbitrary values of $κ$, corresponding to various kind of lattices: from square, through rectangular to almost one-dimensional.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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