Superfluid-insulator transition in a moving system of interacting bosons
摘要
We analyze stability of superfluid currents in a system of strongly interacting ultra-cold atoms in an optical lattice. We show that such a system undergoes a dynamic, irreversible phase transition at a critical phase gradient that depends on the interaction strength between atoms. At commensurate filling, the phase boundary continuously interpolates between the classical modulation instability of a weakly interacting condensate and the equilibrium quantum phase transition into a Mott insulator state at which the critical current vanishes. We argue that quantum fluctuations smear the transition boundary in low dimensional systems. Finally we discuss the implications to realistic experiments.
引用
@article{arxiv.cond-mat/0411047,
title = {Superfluid-insulator transition in a moving system of interacting bosons},
author = {E. Altman and A. Polkovnikov and E. Demler and B. Halperin and M. D. Lukin},
journal= {arXiv preprint arXiv:cond-mat/0411047},
year = {2007}
}
备注
updated refernces and introduction, minor corrections