论文标题
在动量空间中的弱相互作用无序的玻璃气的淬灭动力学
Quench dynamics of a weakly interacting disordered Bose gas in momentum space
论文作者
论文摘要
从理论上讲，我们在有限速度发射的弱相互作用无序的玻璃气体的动量空间中研究了平衡的动力学。在没有相互作用的情况下，连贯的多个散射产生了扩散颗粒的背景，其顶部出现了一致的反向散射干扰。我们使用图形量子传输理论在存在相互作用的情况下重新审视了这种情况。我们发现动力学由描述气体扩散和相干成分的热化的耦合动力学方程控制。这种现象导致了一致的反向散射的破坏，这是由指数弛豫很好地描述的，该指数松弛的速度受粒子碰撞时间控制。这些预测通过数值模拟证实。
We theoretically study the out-of-equilibrium dynamics in momentum space of a weakly interacting disordered Bose gas launched with a finite velocity. In the absence of interactions, coherent multiple scattering gives rise to a background of diffusive particles, on top of which a coherent backscattering interference emerges. We revisit this scenario in the presence of interactions, using a diagrammatic quantum transport theory. We find that the dynamics is governed by coupled kinetic equations describing the thermalization of the diffusive and coherent components of the gas. This phenomenon leads to a destruction of coherent backscattering, well described by an exponential relaxation whose rate is controlled by the particle collision time. These predictions are confirmed by numerical simulations.
