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Quench dynamics of Anderson impurity model using configuration interaction method

机译：配置相互作用法的安德森杂质模型的猝灭动力学

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摘要

We study the quench dynamics of an Anderson impurity model using the configuration interaction (CI) method. In particular, we focus on the relaxation behavior of the impurity occupation. The system is found to behave very differently in the weak-coupling and strong-coupling regimes. In the weak-coupling regime, the impurity occupation relaxes to a time-independent constant quickly after only a few oscillations. In the strong-coupling regime, the impurity occupation develops a fast oscillation, with a much slower relaxation. We show that it is the multipeak structure in the many-body energy spectrum that separates these two regimes. The characteristic behavior, including the power-law decay and the period of oscillation, can also be related to certain features in the many-body energy spectrum. The respective advantages of several impurity solvers are discussed, and the convergence of different CI truncation schemes is provided.
机译：我们使用配置相互作用（CI）方法研究了安德森杂质模型的猝灭动力学。特别地，我们关注杂质占据的弛豫行为。发现该系统在弱耦合和强耦合机制中的行为截然不同。在弱耦合状态下，仅经过几次振荡，杂质的吸收很快就放松到与时间无关的常数。在强耦合状态下，杂质占据会产生快速振荡，而弛豫要慢得多。我们表明，正是多体能谱中的多峰结构将这两个制度区分开了。特征行为，包括幂律衰减和振荡周期，也可能与多体能谱中的某些特征有关。讨论了几种杂质求解器的各自优点，并提供了不同的CI截断方案的收敛性。

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  • 来源
    《Physical review》 |2015年第15期|155135.1-155135.11|共11页
  • 作者

    Chungwei Lin; Alexander A. Demkov;

  • 作者单位

    Department of Physics, The University of Texas at Austin, Austin, Texas 78751, USA,Mitsubishi Electric Research Laboratories, 201 Broadway, Cambridge, Massachusetts 02139, USA;

    Department of Physics, The University of Texas at Austin, Austin, Texas 78751, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    impurity and defect levels;

    机译：杂质和缺陷水平;

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