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arXiv · 1203.5629

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

Chia-Min Chung·Shiang Fang·Pochung Chen
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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

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Chia-Min Chung, Shiang Fang, Pochung Chen. 2012-06-15. Quantum and Thermal Transitions Out of the Pair-Supersolid Phase of Two-Species Bosons in Lattice. https://doi.org/10.1103/physrevb.85.214513

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