Weak first-order superfluid--solid quantum phase transitions

Details Weak first-order superfluid--solid quantum phase transitions Weak first-order superfluid--solid quantum phase transitions

2004-06-02

arxiv.org/abs/cond-mat/0406061v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, revtex4, 6 figures

Scientific paper

10.1103/PhysRevLett.93.230402

We study superfluid--solid zero-temperature transitions in two-dimensional lattice boson/spin models by Worm-Algorithm Monte Carlo simulations. We observe that such transitions are typically first-order with the exception of special high-symmetry points which require fine tuning in the Hamiltonian parameter space. We present evidence that the superfluid--checkerboard solid and superfluid--valence-bond solid transitions at half-integer filling factor are extremely weak first-order transitions and in small systems they may be confused with continuous or high-symmetry points.

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