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arXiv · 1003.1367

Phases of lattice hard core bosons in a periodic superlattice

Long Dang·Massimo Boninsegni
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Abstract

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.

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Long Dang, Massimo Boninsegni. 2010-03-06. Phases of lattice hard core bosons in a periodic superlattice. https://doi.org/10.1103/physrevb.81.224502

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