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arXiv 1109.3045cond-mat.quant-gas
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二维光晶格中自旋1/2玻色子的有限温度phase diagram

Finite temperature phase diagram of spin-1/2 bosons in two-dimensional optical lattice

L. de Forges de Parny, F. Hébert, V. G. Rousseau, G. G. Batrouni

摘要:

利用量子蒙特卡罗模拟方法研究了二维正方晶格上的两种群玻色哈伯德模型,并着重讨论了有限温度效应。我们表明,在两种不同的情况下,铁磁和反铁磁自旋自旋相互作用,相图是由固体莫特相,液相和超流相。在反铁磁的情况下,超流(SF)被极化,而莫特绝缘体(MI)和正常玻色液体(NBL)相不是。另一方面,在铁磁的情况下,没有相被极化。超流-液体转变是Berezinsky-Kosterlitz-无边界型的,而固-液通道是一个交叉。

英文摘要:

We study a two-species bosonic Hubbard model on a two-dimensional square lattice by means of quantum Monte Carlo simulations and focus on finite temperature effects. We show in two different cases, ferro- and antiferromagnetic spin-spin interactions, that the phase diagram is composed of solid Mott phases, liquid phases and superfluid phases. In the antiferromagnetic case, the superfluid (SF) is polarized while the Mott insulator (MI) and normal Bose liquid (NBL) phases are not. On the other hand, in the ferromagnetic case, none of the phases is polarized. The superfluid-liquid transition is of the Berezinsky-Kosterlitz-Thouless type whereas the solid-liquid passage is a crossover.

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