1.Atominstitut der ?sterreichischen Universit?ten,Vienna,Austria;2.A.F. Ioffe Physico-Technical Institute,St. Petersburg,Russia
Abstract:
We provide a simple physical picture of the loss of coherence between two coherently split one-dimensional Bose-Einstein condensates.
The source of the dephasing is identified with nonlinear corrections to the elementary excitation energies in either of the
two independent condensates. We retrieve the result by Burkov, Lukin and Demler Phys. Rev. Lett. 98, 200404 (2007)] on the subexponential decay of the coherence ∝exp -(t/t0)2/3] for the large time t, however, the scaling of t0 differs.