Local relaxation and light-cone-like propagation of correlations in a trapped one-dimensional Bose gas

Author(s): Remi Geiger, Tim Langen, Igor Mazets, J. Schmiedmayer

Journal: New Journal of Physics

Volume: 16

Page(s): 053034

Year: 2014

DOI Number: 10.1088/1367-2630/16/5/053034

Link: Link to publication

Abstract:

We describe the relaxation dynamics of a coherently split one-dimensional (1D) Bose gas in the harmonic approximation. A dephased, prethermalized state emerges in a light-cone-like evolution which is connected to the spreading of correlations with a characteristic velocity. In our description we put special emphasis on the influence of the longitudinal trapping potential and the finite size of the system, both of which are highly relevant in experiments. In particular, we quantify their influence on the phase correlation properties and the characteristic velocity with which the prethermalized state is established. Finally, we show that the trapping potential has an important effect on the recurrences of coherence which are expected to appear in a finite size system.

Note: http://arxiv.org/abs/1312.7568

Schmiedmayer Group Schmiedmayer Group