A multilayer multiconfiguration time-dependent Hartree study of the nonequilibrium Anderson impurity model at zero temperature

TL;DR

This paper applies an advanced multilevel quantum simulation method to study nonequilibrium electron transport in the Anderson impurity model at zero temperature, revealing signatures of the Kondo effect.

Contribution

It introduces two novel techniques within the ML-MCTDH-SQR framework for more accurate simulation of quantum transport in the Kondo regime.

Findings

Successful simulation of Kondo effect signatures

Enhanced methodology for initial state preparation

Effective handling of electronic continuum discretization

Abstract

Quantum transport is studied for the nonequilibrium Anderson impurity model at zero temperature employing the multilayer multiconfiguration time-dependent Hartree theory within the second quantization representation (ML-MCTDH-SQR) of Fock space. To adress both linear and nonlinear conductance in the Kondo regime, two new techniques of the ML-MCTDH-SQR simulation methodology are introduced: (i) the use of correlated initial states, which is achieved by imaginary time propagation of the overall Hamiltonian at zero voltage and (ii) the adoption of the logarithmic discretization of the electronic continuum. Employing the improved methodology, the signature of the Kondo effect is analyzed.