Weakly repulsive soft-core bosons on a sphere stay fluid at low density due to quantum fluctuations but form cluster phases at higher densities, each argued to be supersolid in mean-field.
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Ground state of weakly repulsive soft-core bosons on a sphere
Weakly repulsive soft-core bosons on a sphere stay fluid at low density due to quantum fluctuations but form cluster phases at higher densities, each argued to be supersolid in mean-field.