Dissipative Dynamics of an Open Bose Einstein Condensate

TL;DR

This paper models the dissipative dynamics of an open Bose-Einstein condensate, showing it obeys a Complex Ginzburg-Landau equation and exhibits space-time patterning, with implications for atom laser density profiles.

Contribution

It introduces a dissipative BEC model governed by a Complex Ginzburg-Landau equation, extending beyond the traditional Gross-Pitaevsky framework.

Findings

Dissipative BEC obeys a Complex Ginzburg-Landau equation.

Pattern formation occurs under certain parameters, especially negative scattering length.

Multiple domain regimes are predicted in the dissipative BEC.

Abstract

As an atomic Bose Einstein condensate (BEC) is coupled to a source of uncondensed atoms at the same temperature and to a sink (extraction towards an atom laser) the idealized description in terms of a Gross-Pitaevsky equation (GP) no longer holds. Under suitable physical assumptions we show that the dissipative BEC obeys a Complex Ginzburg Landau equation (CGL) and for some parameter range it undergoes a space time patterning. As a consequence, the density of BEC atoms within the trap displays non trivial space time correlations, which can be detected by monitoring the density profile of the outgoing atom laser. The patterning condition requires a negative scattering length, as e.g. in $^7$Li. In such a case we expect a many domain collapsed regime, rather than a single one as reported for a closed BEC.