Phases of lattice hard core bosons in a periodic superlattice

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.

5 pages, 5 figures

References in corpus (4)

• Many-Body Physics with Ultracold Gases
• Supersolid hardcore bosons on the triangular lattice
• Phase diagram of 4He adsorbed on graphite
• Molecular hydrogen isotopes adsorbed on krypton-preplated graphite: Quantum Monte Carlo simulations

Cited by in corpus (2)

• Superfluid transition of the second layer of He-4 on graphite: does substrate corrugation matter?
• He-4 monolayer on Graphene: a Quantum Monte Carlo study