Pseudogap Kondo Physics from Charge Fluctuations in a Quantum Dot

TL;DR

This paper explores how charge fluctuations in a quantum dot coupled to a 1D electron liquid exhibit pseudogap Kondo physics, revealing quantum critical points and fixed points through differential capacitance analysis.

Contribution

It demonstrates the emergence of pseudogap Kondo behavior in a quantum dot system and analyzes quantum criticality via charge fluctuations and capacitance measurements.

Findings

Behavior similar to multichannel pseudogap Kondo model

Access to quantum critical points by tuning coupling

Differential capacitance reveals system details

Abstract

We consider charge fluctuations in a quantum dot coupled to an interacting one-dimensional electron liquid. We find the behavior of this system to be similar to the multichannel pseudogap Kondo model. By tuning the coupling between the dot and the one-dimensional electron liquid, one can access the quantum critical point and the various fixed points which arise. The differential capacitance is computed and is shown to contain detailed information about the system.