Dark-bright solitons in Bose-Einstein condensates at finite temperatures

作者：Achilleos V; Yan D; Kevrekidis P G; Frantzeskakis D J^*

来源：New Journal of Physics, 2012, 14(5): 055006.

DOI：10.1088/1367-2630/14/5/055006

We study the dynamics of dark-bright (DB) solitons in binary mixtures of Bose gases at finite temperature using a system of two coupled dissipative Gross-Pitaevskii equations. We develop a perturbation theory for the two-component system to derive an equation of motion for the soliton centers and identify different temperature-dependent damping regimes. We show that the effect of the bright (%26apos;filling%26apos;) soliton component is to partially stabilize %26apos;bare%26apos; dark solitons against temperature-induced dissipation, thus providing longer lifetimes. We also study analytically thermal effects on DB soliton %26apos;molecules%26apos; (i.e. two in-phase and out-of-phase DB solitons), showing that they undergo expanding oscillations while interacting. Our analytical findings are in good agreement with results obtained via a Bogoliubov-de Gennes analysis and direct numerical simulations.

• 出版日期2012-5-1