Universal conductivity in a two-dimensional superfluid-to-insulator quantum critical system.

Abstract

We compute the universal conductivity of the (2+1)-dimensional XY universality class, which is realized for a superfluid-to-Mott insulator quantum phase transition at constant density. Based on large-scale Monte Carlo simulations of the classical (2+1)-dimensional J-current model and the two-dimensional Bose-Hubbard model, we can precisely determine the… (More)

Cite this paper

@article{Chen2014UniversalCI, title={Universal conductivity in a two-dimensional superfluid-to-insulator quantum critical system.}, author={Kun Chen and Longxiang Liu and Youjin Deng and Lode Pollet and Nikolay Prokof'ev}, journal={Physical review letters}, year={2014}, volume={112 3}, pages={030402} }