Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-03-06
Phys. Rev. B 81, 224502 (2010)
Physics
Condensed Matter
Quantum Gases
5 pages, 5 figures
Scientific paper
10.1103/PhysRevB.81.224502
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.
Boninsegni Massimo
Dang Long
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