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

Probing Electron-Electron Interactions with a Quantum Antidot