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Effect of fluctuations on the superfluid-supersolid phase transition on the lattice

Schutzhold, Ralf; Uhlmann, Michael; Fischer, Uwe


We derive a controlled expansion into mean field plus fluctuations for the extended Bose-Hubbard model, involving interactions with many neighbors on an arbitrary periodic lattice, and study the superfluid-supersolid phase transition. Near the critical point, the impact of (thermal and quantum) fluctuations on top of the mean field grows, which entails striking effects, such as negative superfluid densities and thermodynamical instability of the superfluid phase-earlier as expected from...[Show more]

CollectionsANU Research Publications
Date published: 2008
Type: Journal article
Source: Physical Review A: Atomic, Molecular and Optical Physics
DOI: 10.1103/PhysRevA.78.033604


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