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arXiv · 1603.07270

Ground state phase diagram of Gaussian-Core bosons in two dimensions

Peter Kroiss·Massimo Boninsegni·Lode Pollet
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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.

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Peter Kroiss, Massimo Boninsegni, Lode Pollet. 2016-05-31. Ground state phase diagram of Gaussian-Core bosons in two dimensions. https://doi.org/10.1103/physrevb.93.174520

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