Nonequilibrium magnetotransport through a quantum dot: An interpolative perturbative approach

TL;DR

This paper investigates magnetotransport in quantum dots using an interpolative perturbative approach, revealing how magnetic fields influence conductance and spectral density, aligning with experimental observations.

Contribution

Introduces a spin-dependent interpolative perturbative method for the Anderson model that conserves current and analyzes magnetotransport properties.

Findings

Differential conductance exhibits split peaks at high magnetic fields.

Splitting in conductance peaks exceeds spectral density splitting, matching experiments.

Method effectively captures nonequilibrium magnetotransport phenomena.

Abstract

We study the differential conductance, spectral density and magnetization, for a quantum dot coupled to two conducting leads as a function of bias voltage, magnetic field and temperature. The system is modeled with the Anderson model solved using a spin dependent interpolative perturbative approximation in the Coulomb repulsion U that conserves the current. For large enough magnetic field, the differential conductance as a function of bias voltage shows split peaks. This splitting is larger than the corresponding splitting in the spectral density of states, in agreement with experiment.