Supersolid Order from Disorder: Hard-Core Bosons on the Triangular Lattice

Abstract

We study the interplay of Mott localization, geometric frustration, and superfluidity for hard-core bosons with nearest-neighbor repulsion on the triangular lattice. For this model at half-filling, we demonstrate that superfluidity survives for arbitrarily large repulsion, and that diagonal solid order emerges in the strongly correlated regime from an order-by-disorder mechanism. This is thus an unusual example of a stable supersolid phase of hard-core lattice bosons at a commensurate filling.

4 pages, 2 figures; finite-size scaling discussion added

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• Ising models of quantum frustration
• Supersolid hardcore bosons on the triangular lattice
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