Absence of Coulomb Blockade in the Anderson Impurity Model at the Symmetric Point

Amikam Levy, Lyran Kidon, David T. Limmer, Eran Rabaniy

Published 2019-01-11Version 1

In this work, we investigate the characteristics of the electric current in the so called symmetric Anderson impurity model. We study the nonequilibrium model usingtwo complementary approximate methods, the perturbative quantum master equation approach to the reduced density matrix, and a self-consistent equation of motion approach to the nonequilibrium Green's function. We find that at a particular symmetry point, an interacting Anderson impurity model recovers the same steady-state current as an equivalent non-interacting model, akin a two-band resonant level model. We show this for a wide range of parameters at temperatures above the Kondo crossover regime, where the approximate master equation approach and the Green's function method provide accurate results for the current. We conclude that the steady-state current in the symmetric Anderson model does not encode characteristics of a many-body interacting system.