Competition between Kondo screening and quantum Hall edge reconstruction

TL;DR

This paper investigates how quantum Hall edge reconstruction impacts Kondo effects in a quantum dot, revealing complex interactions between magnetic fields, edge structures, and Kondo screening.

Contribution

It demonstrates the influence of quantum Hall edge structures on Kondo screening and g-factor renormalization in a quantum dot system under magnetic fields.

Findings

Suppression of Kondo effect varies with magnetic field orientation.

Discontinuous changes in zero-bias anomaly split linked to edge structure.

Quantum Hall edge reconstruction significantly alters Kondo temperature.

Abstract

We report on a Kondo correlated quantum dot connected to two-dimensional leads where we demonstrate the renormalization of the g-factor in the pure Zeeman case i.e, for magnetic fields parallel to the plane of the quantum dot. For the same system we study the influence of orbital effects by investigating the quantum Hall regime i.e. a perpendicular magnetic field is applied. In this case an unusual behaviour of the suppression of the Kondo effect and of the split zero-bias anomaly is observed. The splitting decreases with magnetic field and shows discontinuous changes which are attributed to the intricate interplay between Kondo screening and the quantum Hall edge structure originating from electrostatic screening. This edge structure made up of compressible and incompressible stripes strongly affects the Kondo temperature of the quantum dot and thereby influences the renormalized g-factor.