Supersolid Hard-Core Bosons on the Triangular Lattice

Journal Article · Fri Sep 16 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.127205· OSTI ID:20699444

Wessel, Stefan ^[1]; Troyer, Matthias ^[2]

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1. Institut fuer Theoretische Physik III, Universitaet Stuttgart, 70550 Stuttgart (Germany)
2. Theoretische Physik, ETH Zuerich, CH-8093 Zurich (Switzerland)

We determine the phase diagram of hard-core bosons on a triangular lattice with nearest-neighbor repulsion, paying special attention to the stability of the supersolid phase. Similar to the same model on a square lattice we find that for densities {rho}<1/3 or {rho}>2/3 a supersolid phase is unstable and the transition between a commensurate solid and the superfluid is of first order. At intermediate fillings 1/3<{rho}<2/3 we find an extended supersolid phase even at half filling {rho}=1/2. The emergence of the supersolid on the triangular lattice reflects a novel and interesting way for a quantum system to avoid classical frustration, similar to an order-by-disorder mechanism. It also offers an exciting possibility of realizing such phenomena in ultracold atoms on optical lattices.

• OSTI ID: 20699444
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMS
BOSONS
DENSITY
PHASE DIAGRAMS
STABILITY
SUPERFLUIDITY