Effect of fluctuations on the superfluid-supersolid phase transition on the lattice
arXiv:0801.3984 · doi:10.1103/PhysRevA.78.033604
Abstract
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.
arXiv comment5 pages of RevTex4; as published in Physical Review A
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Cited by in corpus (8)
- Ultracold bosons with short-range interaction in regular optical lattices
- Emergence of coherence in the Mott--superfluid quench of the Bose-Hubbard model
- O(N) symmetry-breaking quantum quench: Topological defects versus quasiparticles
- Schwinger-Keldysh approach to out of equilibrium dynamics of the Bose Hubbard model with time varying hopping
- Many-site coherence revivals in the extended Bose-Hubbard model and the Gutzwiller approximation
- The BBGKY hierarchy for ultracold bosonic systems: II. Applications
- Dynamical quantum phase transitions
- Identifying strongly correlated supersolid states on the optical lattice by quench-induced π-states