Universal scaling in transport out of equilibrium through a single quantum dot using the noncrossing approximation

TL;DR

This paper investigates universal scaling laws in nonequilibrium quantum dot transport using the Anderson model and non-crossing approximation, showing good agreement with experiments and theory in different regimes.

Contribution

It demonstrates universal scaling behavior in quantum dot conductance out of equilibrium using a non-crossing approximation approach.

Findings

Good scaling function in Kondo and mixed valent regimes

Excellent agreement with recent experiments in mixed valent regime

Validates the use of non-crossing approximation for nonequilibrium transport

Abstract

The universal scaling behavior is studied for nonequilibrium transport through a quantum dot. To describe the dot we use the standard Anderson impurity model and use the non-equilibrium non-crossing approximation in the limit of infinite Coulomb repulsion. After solving de hamiltonian, we calculate the conductance through the system as a function of temperature $T$ and bias voltage $V$ in the Kondo and in the mixed valent regime. We obtain a good scaling function in both regimes. In particular, in the mixed valent regime, we find excellent agreement with recent experiments and previous theoretical works.