Phys. Rev. Lett. 95, 127207 (2005) [4 pages]

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

Abstract

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R. G. Melko¹, A. Paramekanti², A. A. Burkov¹, A. Vishwanath², D. N. Sheng³, and L. Balents¹
¹Department of Physics, University of California, Santa Barbara, California 93106, USA
²Department of Physics, University of California, Berkeley, California 94720, USA
³Department of Physics and Astronomy, California State University, Northridge, California 91330, USA

Received 16 May 2005; published 16 September 2005

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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.95.127207

DOI:

10.1103/PhysRevLett.95.127207

PACS:

75.10.Jm, 05.30.Jp, 67.40.−w, 67.80.−s

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Phys. Rev. Lett. 95, 127207 (2005) [4 pages]

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