Effects of frustration on the anisotropic triangular lattice bosons

Journal Article · Tue Jul 01 04:00:00 EDT 2008 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.78.014513· OSTI ID:21143580

Jingyu, Gan ^[1]

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1. Institute of Physics, Chinese Academy of Sciences, Beijing 100080 (China)

We study the extended hard-core Bose-Hubbard model with nearest-neighbor interactions on a triangular lattice with spatial anisotropy by quantum Monte Carlo simulations. The effects of the geometric frustration or the anisotropic strength, represented by the ratio t{sup '}/t between the intrachain nearest-neighbor hopping t{sup '} and the interchain hopping t, are studied. We find that for small values of anisotropy ratio t{sup '}/t, a solid state emerges at {rho}=1/2 and a supersolid is unstable toward phase separation; for large values of anisotropy ratio t{sup '}/t, solid states emerge at {rho}=1/3, 2/3, and a supersolid phase is stable in the region {rho}<2/3; for intermediate values of anisotropy ratio t{sup '}/t, three kinds of solid states at fillings {rho}=1/3, 1/2, and {rho}=2/3 coexist and no stable supersolid phase is observed. At half filling, we find that with increasing frustration t{sup '}/t, the {rho}=1/2 solid transitions indirectly into the supersolid via an intervening superfluid.

• OSTI ID: 21143580
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 1 Vol. 78; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
BOSONS
COMPUTERIZED SIMULATION
CRYSTAL STRUCTURE
HUBBARD MODEL
INTERACTIONS
MONTE CARLO METHOD
SOLIDS
SUPERFLUIDITY
TRIANGULAR CONFIGURATION