Effects of frustration on the anisotropic triangular lattice bosons
- 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, Vol. 78, Issue 1; Other Information: DOI: 10.1103/PhysRevB.78.014513; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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