Superfluid to Mott insulator transition of hardcore bosons in a superlattice
- Department of Physics, Georgetown University, Washington, DC 20057 (United States)
We study the superfluid to Mott-insulator transition of hardcore bosons in commensurate superlattices in two and three dimensions. We focus on the special case where the superlattice has period two and the system is at half-filling. We obtain numerical results by using the stochastic series expansion algorithm, and compute various properties of the system, such as the ground-state energy, the density of bosons in the zero-momentum mode, the superfluid density, and the compressibility. We employ finite-size scaling to extrapolate the thermodynamic limit, and find the critical points of the phase transition. We also explore the extent to which several approximate solutions such as mean-field theory, with and without spin-wave corrections, can help one gain analytical insight into the behavior of the system in the vicinity of the phase transition.
- OSTI ID:
- 21287079
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 80, Issue 13; Other Information: DOI: 10.1103/PhysRevB.80.134508; (c) 2009 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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