Numerically Exact Long Time Magnetization Dynamics at the Nonequilibrium Kondo Crossover of the Anderson Impurity Model

TL;DR

This paper presents a numerically exact study of the nonequilibrium Anderson model, revealing new phenomena in magnetization dynamics across the Kondo crossover, including non-monotonic temperature effects and oscillatory behavior.

Contribution

It introduces a combined quantum Monte Carlo and memory function approach to accurately analyze long-time dynamics in previously inaccessible regimes of the Anderson model.

Findings

Non-monotonic temperature dependence of observables at high bias

Oscillatory quench dynamics at high magnetic fields

Converged results in the Kondo crossover regime

Abstract

We investigate the dynamical and steady-state spin response of the nonequilibrium Anderson model to magnetic fields, bias voltage, and temperature using a numerically exact method combining a bold-line quantum Monte Carlo technique with the memory function formalism. We obtain converged results in a range of previously inaccessible regimes, in particular the crossover to the Kondo domain. We provide detailed predictions for novel nonequilibrium phenomena, including non-monotonic temperature dependence of observables at high bias voltage and oscillatory quench dynamics at high magnetic fields.