Transient dynamics of the Anderson impurity model out of equilibrium
Transient dynamics of the Anderson impurity model out of equilibrium
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DOI：
10.1103/physrevb.78.235110
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发表时间：
2008-08
影响因子：
3.7
通讯作者：
T. Schmidt;P. Werner;L. Muehlbacher;A. Komnik
中科院分区：
文献类型：
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作者：
T. Schmidt;P. Werner;L. Muehlbacher;A. Komnik
我们讨论了当两个有限带宽的费米子连续体瞬时耦合到中心能级时，Anderson杂质模型中的瞬时效应。我们首先给出了解析可解的非相互作用共振态能级系统的结果，然后利用传统的微扰理论和最近发展的非平衡蒙特卡罗模拟方法将它们一致地推广到相互作用的情况。主要目的是了解全时间相关的非线性电流-电压特性和中心能级的布居概率。我们发现，与稳态相反，系统的暂态动力学敏感地依赖于电极材料的带宽。
We discuss the transient effects in the Anderson impurity model that occur when two fermionic continua with finite bandwidths are instantaneously coupled to a central level. We present results for the analytically solvable noninteracting resonant-level system first and then consistently extend them to the interacting case using the conventional perturbation theory and recently developed nonequilibrium Monte Carlo simulation schemes. The main goal is to gain an understanding of the full time-dependent nonlinear current-voltage characteristics and the population probability of the central level. We find that, contrary to the steady state, the transient dynamics of the system depends sensitively on the bandwidth of the electrode material.