Probing Electron-Electron Interactions with a Quantum Antidot

TL;DR

This paper investigates electron-electron interactions in quantum antidots within the integer quantum Hall regime using transport measurements and computational models to understand spin and charge dynamics.

Contribution

It combines experimental transport data with computational modeling to explore the effects of electron interactions and spin structure in quantum antidots.

Findings

Probing of excitation spectra via transport measurements.

Inference of antidot spin-structure from spin-resolved transport.

Insights into collective electron dynamics in IQH systems.

Abstract

In the integer quantum Hall (IQH) regime, an antidot provides a finite, controllable `edge' of quantum Hall fluid that is an ideal laboratory for investigating the collective dynamics of large numbers of interacting electrons. Transport measurements of single antidots probe the excitation spectra of the antidot edge, and gate-defined antidot devices offer the flexibility to vary both the antidot's dimensions and its couplings to extended IQH edge modes which serve as leads. We also use the spin-selectivity of the IQH edge modes to perform spin-resolved transport measurements, from which we can infer the antidot spin-structure. This thesis describes a combination of such transport experiments and related computational models designed to investigate the effects of electron-electron interactions in quantum antidots, with general implications for the physics of spin and charge in IQH systems.