Decay of super-currents in condensates in optical lattices

Details Decay of super-currents in condensates in optical lattices Decay of super-currents in condensates in optical lattices

2005-04-12

arxiv.org/abs/cond-mat/0504300v1

Journal of Superconductivity, vol. 17, 577 (2004)

Physics

Condensed Matter

Superconductivity

Contribution to the special issue of Journal of Superconductivity in honor of Michael Tinkham's 75th birthday

Scientific paper

10.1007/s10948-004-0771-2

In this paper we discuss decay of superfluid currents in boson lattice systems due to quantum tunneling and thermal activation mechanisms. We derive asymptotic expressions for the decay rate near the critical current in two regimes, deep in the superfluid phase and close to the superfluid-Mott insulator transition. The broadening of the transition at the critical current due to these decay mechanisms is more pronounced at lower dimensions. We also find that the crossover temperature below which quantum decay dominates is experimentally accessible in most cases. Finally, we discuss the dynamics of the current decay and point out the difference between low and high currents.

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