Finite-temperature phase diagram of hard-core bosons in two dimensions |
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Authors: | Schmid Guido Todo Synge Troyer Matthias Dorneich Ansgar |
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Affiliation: | Theoretische Physik, Eidgen?ssische Technische Hochschule Zürich, CH-8093 Zürich, Switzerland. |
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Abstract: | We determine the finite-temperature phase diagram of the square lattice hard-core boson Hubbard model with nearest neighbor repulsion using quantum Monte Carlo simulations. This model is equivalent to an anisotropic spin-1/2 XXZ model in a magnetic field. We present the rich phase diagram with a first order transition between a solid and superfluid phase, instead of a previously conjectured supersolid and a tricritical end point to phase separation. Unusual reentrant behavior with ordering upon increasing the temperature is found, similar to the Pomeranchuk effect in 3He. |
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