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arXiv 1101.4282cond-mat.quant-gas
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有限温度对赝一维Bose-哈伯德模型中莫特绝缘体相鲁棒性的影响

Effects of finite temperature on the robustness of the Mott insulator phase in pseudo one-dimensional Bose-Hubbard Model

Motoyoshi Inoue, Keita Kobayashi, Yusuke Nakamura, Yoshiya Yamanaka

摘要:

研究了一维光晶格系统中的超流-莫特绝缘体(SF-MI)相变,采用二维的玻色-哈伯德模型,其中一个方向是光晶格,另一个方向是束缚的谐波陷阱,称之为赝一维玻色-哈伯德模型.考虑了与谐波陷阱有关的几种激发态。莫特波瓣在$μ$-$J$相图的$μ$和$J$方向收缩。收缩的发生是因为涉及激发态的相互作用变得比处于基态的粒子之间的相互作用弱。由于在有限温度下,汉密尔顿本征态之间的能量间距减小,因此原位粒子的色散增加。激发态对有限温度下MI相的稳定性有显著影响。

英文摘要:

We study the superfluid-Mott insulator (SF-MI) transition in an one-dimensional optical lattice system, and employ the Bose-Hubbard model in two dimension with a combined potential of an optical lattice in one direction and a confining harmonic trap in the other direction, which we refer to as the pseudo one-dimension Bose-Hubbard model. There some excited states with respect to the harmonic trap are considered. The Mott lobes shrink in the $μ$ and $J$ directions of the $μ$-$J$ phase diagram. The shrinkage occurs because the interactions involving the excited states become weaker than that between particles in the ground state. The dispersion of the in-site particle increases because the energy spacing between the eigenstates of the Hamiltonian decreases at finite temperature. The excited states significantly affect the robustness of the MI phase at finite temperate.

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