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

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

2008-01-25

arxiv.org/abs/0801.3984v2

Phys. Rev. A 78, 033604 (2008)

Physics

Condensed Matter

Other Condensed Matter

5 pages of RevTex4; as published in Physical Review A

Scientific paper

10.1103/PhysRevA.78.033604

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 mean-field dynamics. We also predict the existence of long-lived "supercooled" states with anomalously large quantum fluctuations.

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