Superfluid to Mott insulator transition of hardcore bosons in a superlattice

Itay Hen, Marcos Rigol

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27 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number134508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number13
DOIs
StatePublished - Oct 9 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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