Coherent Transport through a Quantum Dot Embedded in an Aharonov-Bohm Ring

TL;DR

This paper investigates quantum interference effects in a mesoscopic Aharonov-Bohm ring with an embedded quantum dot, explaining experimental anomalies and proposing new conductance oscillation features for model validation.

Contribution

It introduces a model using the Friedel sum rule to explain anomalous transport features and predicts new conductance oscillation phenomena in quantum dot-ring systems.

Findings

Explains experimental anomalies via quantum interference effects.

Proposes a new conductance oscillation feature as a test for the model.

Links quantum dot levels to transport anomalies.

Abstract

We study the coherent transport in multi-terminal mesoscopic Aharonov-Bohm ring with a quantum dot embedded in an arm. Employing the Friedel sum rule for the effective single-particle levels in the quantum dot, we explain some anomalous features which have been observed in the experiment. We attribute these anomalies to the result of nontrivial quantum interference of the quantum dot with the attached ring. Further, we propose a new feature of conductance oscillations which can be a test for the validity of our model.