Universal Scaling of the Conductivity at the Superfluid-Insulator Phase Transition

Details Universal Scaling of the Conductivity at the Superfluid-Insulator Phase Transition Universal Scaling of the Conductivity at the Superfluid-Insulator Phase Transition

2005-09-26

arxiv.org/abs/cond-mat/0509671v1

Physical Review Letters, 95, 180603 (2005)

Physics

Condensed Matter

Other Condensed Matter

Accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.95.180603

The scaling of the conductivity at the superfluid-insulator quantum phase transition in two dimensions is studied by numerical simulations of the Bose-Hubbard model. In contrast to previous studies, we focus on properties of this model in the experimentally relevant thermodynamic limit at finite temperature T. We find clear evidence for deviations from w_k-scaling of the conductivity towards w_k/T-scaling at low Matsubara frequencies w_k. By careful analytic continuation using Pade approximants we show that this behavior carries over to the real frequency axis where the conductivity scales with w/T at small frequencies and low temperatures. We estimate the universal dc conductivity to be 0.45(5)Q^2/h, distinct from previous estimates in the T=0, w/T >> 1 limit.

Affiliated with

Also associated with

No associations

Rating

Universal Scaling of the Conductivity at the Superfluid-Insulator Phase Transition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Universal Scaling of the Conductivity at the Superfluid-Insulator Phase Transition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universal Scaling of the Conductivity at the Superfluid-Insulator Phase Transition will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-225415