Quantum and Thermal Transitions Out of the Pair-Supersolid Phase of Two-Species Bosons in Lattice

Abstract

We investigate two-species bosons in a two-dimensional square lattice by quantum Monte Carlo method. We show that the inter-species attraction and nearest-neighbor intra-species repulsion results in the pair-supersolid phase, where a diagonal solid order coexists with an off-diagonal pair-superfluid order. The quantum and thermal transitions out of the pair-supersolid phase are characterized. It is found that there is a direct first order transition from the pair-supersolid phase to the double-superfluid phase without an intermediate region. Furthermore, the melting of the pair-supersolid occurs in two steps. Upon heating, first the pair-superfluid is destroyed via a KT transition then the solid order melts via an Ising transition

References in corpus (4)

• Supersolids versus phase separation in two-dimensional lattice bosons
• Quantum and thermal transitions out of the supersolid phase of a 2D quantum antiferromagnet
• Mott-insulator phases of non-locally coupled 1D dipolar Bose gases
• Quantum phase transitions of two-species bosons in square lattice

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• Magnetic polarons in two-component hard core bosons