TY - JOUR
T1 - Effect of fluctuations on the superfluid-supersolid phase transition on the lattice
AU - Schützhold, Ralf
AU - Uhlmann, Michael
AU - Fischer, Uwe R.
PY - 2008/9/8
Y1 - 2008/9/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=51649120883&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.78.033604
DO - 10.1103/PhysRevA.78.033604
M3 - Article
SN - 1050-2947
VL - 78
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 3
M1 - 033604
ER -