Quantum phase transition in a two-channel-Kondo quantum dot device

TL;DR

This paper develops a theoretical framework for electron transport in a double quantum dot device to observe the two-channel Kondo effect, focusing on tuning to a quantum critical point and predicting conductance behavior.

Contribution

It introduces a method to tune the device to a non-Fermi-liquid fixed point and analyzes the associated quantum phase transition.

Findings

Predicted differential conductance near the quantum critical point.

Provided a strategy for experimental tuning of the device.

Characterized the quantum phase transition in the system.

Abstract

We develop a theory of electron transport in a double quantum dot device recently proposed for the observation of the two-channel Kondo effect. Our theory provides a strategy for tuning the device to the non-Fermi-liquid fixed point, which is a quantum critical point in the space of device parameters. We explore the corresponding quantum phase transition, and make explicit predictions for behavior of the differential conductance in the vicinity of the quantum critical point.