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Kroiss, Peter; Boninsegni, Massimo; Pollet, Lode (2016): Ground-state phase diagram of Gaussian-core bosons in two dimensions. In: Physical Review B, Vol. 93, No. 17, 174520
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Abstract

The ground state of a two-dimensional (2D) system of Bose particles of spin zero, interacting via a repulsive Gaussian-core potential, has been investigated by means of quantum Monte Carlo simulations. The quantum phase diagram is qualitatively identical to that of 2D Yukawa bosons. While the system is a fluid at all densities for weak coupling, in the strong-coupling regime it transitions upon compression from a low-density superfluid to a crystal, and then into a reentrant superfluid phase. No evidence of a (supersolid) cluster crystal phase is seen.