Nonequilibrium transport through a singlet-triplet Anderson impurity

TL;DR

This paper investigates the nonequilibrium transport properties of a complex Anderson impurity model involving singlet, doublet, and triplet states, providing insights into quantum critical behavior and explaining recent experimental observations.

Contribution

It introduces an exact solution approach for the Anderson model with multiple impurity configurations and analyzes conductance near quantum criticality.

Findings

Conductance varies with temperature and bias voltage near the critical line.

Results match recent experimental measurements in single-molecule quantum dots.

Provides a theoretical framework for understanding complex impurity systems.

Abstract

We study the Anderson model in which a configuration with a doublet is hybridized with another with a singlet and a triplet. We calculate the conductance through the system as a function of temperature and bias voltage, near the quantum critical line for which the system is exactly solvable. The results explain recent transport measurements in a single-molecule quantum dot.