Weak first-order superfluid--solid quantum phase transitions

Abstract

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.

4 pages, revtex4, 6 figures

References in corpus (2)

• "Deconfined" quantum critical points
• Two-Dimensional Quantum XY Model with Ring Exchange and External Field

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