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arXiv 1003.1367cond-mat.quant-gascond-mat.stat-mech
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周期超晶格中格点硬核玻色子的位相

Phases of lattice hard core bosons in a periodic superlattice

Long Dang, Massimo Boninsegni

摘要:

本文用量子蒙特卡罗模拟方法研究了具有最近邻排斥相互作用的超晶格硬核玻色子的相图。对于一个中等的吸附强度,该系统形成注册的吸附晶格的晶相,一个“超固体”相存在,在空位和间隙侧,而在膨胀的超流密度消失。讨论了这些结果与吸附在石墨上的$^4$ He膜实验的可能相关性。

英文摘要:

We study by Quantum Monte Carlo simulations the phase diagram of lattice hard core bosons with nearest-neighbour repulsive interactions, in the presence of a super-lattice of adsorption sites. For a moderate adsorption strength, the system forms crystal phases registered with the adsorption lattice; a "supersolid" phase exists, on both the vacancy and interstitial sides, whereas at commensuration the superfluid density vanishes. The possible relevance of these results to experiments on $^4$He films adsorbed on graphite is discussed.

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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