Quantum Monte-Carlo study of a two-species boson Hubbard model

Abstract

We consider a two-species hard-core boson Hubbard model for a supersolid, where the two types of bosons represent vacancies and interstitials doped into a commensurate crystal. The on-site inter-species interaction may create bound states of vacancies and interstitials facilitating vacancy condensation at lower energies than in a single-species model, as suggested in an earlier mean field study. Here we carry out quantum Monte Carlo simulation to study possible supersolid phases of the model, corresponding to superfluid phases of the vacancies or interstitials. At low temperatures, we find three distinct superfluid phases. The extent of the phases and the nature of the phase transitions are discussed in comparison to mean-field theory.

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• Pomeranchuk effect and spin-gradient cooling of Bose-Bose mixtures in an optical lattice
• Anisotropic pair-superfluidity of trapped two-component Bose gases
• Worm quantum Monte-Carlo study of phase diagram of extended Jaynes-Cummings-Hubbard model
• Bose-Hubbard model with occupation-parity couplings