Dephasing in coherently-split quasicondensates

Details Dephasing in coherently-split quasicondensates Dephasing in coherently-split quasicondensates

2010-11-10

arxiv.org/abs/1011.2276v2

Phys. Rev. A 83, 023618 (2011)

Physics

Condensed Matter

Quantum Gases

revtex4, 9 pages, 8 figures

Scientific paper

10.1103/PhysRevA.83.023618

We numerically model the evolution of a pair of coherently split quasicondensates. A truly one-dimensional case is assumed, so that the loss of the (initially high) coherence between the two quasicondensates is due to dephasing only, but not due to the violation of integrability and subsequent thermalization (which are excluded from the present model). We confirm the subexponential time evolution of the coherence between two quasicondensates $\propto \exp [-(t/t_0)^{2/3}]$, experimentally observed by S. Hofferberth {\em et. al.}, Nature {\bf 449}, 324 (2007). The characteristic time $t_0$ is found to scale as the square of the ratio of the linear density of a quasicondensate to its temperature, and we analyze the full distribution function of the interference contrast and the decay of the phase correlation.

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