Prediction of the capacitance lineshape in two-channel quantum dots

TL;DR

This paper proposes a quantum dot setup to observe two-channel Kondo physics, deriving a Hamiltonian model and predicting a measurable capacitance lineshape characteristic of the phenomenon.

Contribution

It introduces a novel quantum dot configuration for two-channel Kondo effect and provides detailed theoretical predictions for capacitance measurements.

Findings

Capacitance lineshape is robust and experimentally verifiable.

Derived a microscopic Hamiltonian connecting to the two-channel Anderson model.

Predicted specific differential capacitance behavior in the proposed setup.

Abstract

We propose a set-up to realize two-channel Kondo physics using quantum dots. We discuss how the charge fluctuations on a small dot can be accessed by using a system of two single electron transistors arranged in parallel. We derive a microscopic Hamiltonian description of the set-up that allows us to make connection with the two-channel Anderson model (of extended use in the context of heavy-Fermion systems) and in turn make detailed predictions for the differential capacitance of the dot. We find that its lineshape, which we determined precisely, shows a robust behavior that should be experimentally verifiable.