Weak First-Order Superfluid-Solid Quantum Phase Transitions
This is the pre-published version harvested from ArXiv. The published version is located at http://prl.aps.org/abstract/PRL/v93/i23/e230402
We study superfluid-solid zero-temperature transitions in two-dimensional lattice boson-spin models using 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 can be confused with continuous or high-symmetry points.
A Kuklov, Nikolai Prokof'ev, and Boris Svistunov. "Weak First-Order Superfluid-Solid Quantum Phase Transitions" Physical Review Letters 93.23 (2004).
Available at: http://works.bepress.com/boris_svistunov/18