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arXiv 0708.2667cond-mat.str-elcond-mat.stat-mechquant-ph
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玻色粒子穿过莫特绝缘体到超流相界面的迁移

Migration of bosonic particles across a Mott insulator to superfluid phase interface

Michael J. Hartmann, Martin B. Plenio

摘要:

本文考虑了单位填充下Bose-哈伯德模型中莫特绝缘体和超流区之间的边界。最初,两个区域被解耦并冷却到它们各自的基态。我们发现,在两个区域之间切换一个小的隧道速率后,莫特区域的所有粒子迁移到超流区域。当两个区域的化学势之差小于超流体的任何本征模的最大能量时,就会发生这种迁移。我们验证了我们的结果与DMRG模拟数值,并解释他们解析与主方程近似,找到两种方法之间的良好协议。最后,我们对微腔与光晶格耦合阵列中观察这种效应进行了可行性研究。

英文摘要:

We consider a boundary between a Mott insulator and a superfluid region of a Bose-Hubbard model at unit filling. Initially both regions are decoupled and cooled to their respective ground states. We show that, after switching on a small tunneling rate between both regions, all particles of the Mott region migrate to the superfluid area. This migration takes place whenever the difference between the chemical potentials of both regions is less than the maximal energy of any eigenmode of the superfluid. We verify our results numerically with DMRG simulations and explain them analytically with a master equation approximation, finding good agreement between both approaches. Finally we carry out a feasibility study for the observation of the effect in coupled arrays of micro-cavities and optical lattices.

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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