Beyond mean-field dynamics in open Bose-Hubbard chains
Beyond mean-field dynamics in open Bose-Hubbard chains
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DOI：
10.1103/physreva.83.063608
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发表时间：
2011-06-07
影响因子：
2.9
通讯作者：
Wimberger, S.
中科院分区：
文献类型：
--
作者：
Witthaut, D.;Trimborn, F.;Wimberger, S.
研究了相位噪声和粒子损失对光晶格中玻色-爱因斯坦凝聚动力学的影响。从多体主方程出发，讨论了广义平均场近似在耗散存在下的适用性，以及通过引入高阶关联函数来模拟平均场以外的量子效应的方法。结果表明，局部粒子耗散导致令人惊讶的动力学，因为它可以抑制衰变和恢复的相干性的玻色-爱因斯坦凝聚。这些效应可以应用于工程相干结构，如稳定的离散呼吸子和暗孤子。
We investigate the effects of phase noise and particle loss on the dynamics of a Bose-Einstein condensate in an optical lattice. Starting from the many-body master equation, we discuss the applicability of generalized mean-field approximations in the presence of dissipation as well as methods to simulate quantum effects beyond mean field by including higher-order correlation functions. It is shown that localized particle dissipation leads to surprising dynamics, as it can suppress decay and restore the coherence of a Bose-Einstein condensate. These effects can be applied to engineer coherent structures such as stable discrete breathers and dark solitons.