Eckstein Martin, Kollar Marcus
Institute for Physics, University of Augsburg, 86135 Augsburg, Germany.
Phys Rev Lett. 2008 Mar 28;100(12):120404. doi: 10.1103/PhysRevLett.100.120404. Epub 2008 Mar 27.
We present the exact solution of the Falicov-Kimball model after a sudden change of its interaction parameter using nonequilibrium dynamical mean-field theory. For different interaction quenches between the homogeneous metallic and insulating phases the system relaxes to a nonthermal steady state on time scales on the order of variant Planck's over 2pi/bandwidth, showing collapse and revival with an approximate period of h/interaction if the interaction is large. We discuss the reasons for this behavior and provide a statistical description of the final steady state by means of generalized Gibbs ensembles.
我们使用非平衡动态平均场理论，给出了Falicov-Kimball模型相互作用参数突然变化后的精确解。对于均匀金属相和绝缘相之间不同的相互作用猝灭，系统在时间尺度约为普朗克常数乘以2π除以带宽的量级上弛豫到非热稳态，如果相互作用较大，则会以约为普朗克常数除以相互作用的近似周期呈现坍缩和复苏。我们讨论了这种行为的原因，并通过广义吉布斯系综对最终稳态进行了统计描述。
