Leibniz MMS Days 2018 - Abstract

Marquardt, Oliver

Computational design of core-shell nanowire crystal-phase quantum rings for the observation of Aharonov-Bohm oscillations

Despite their charge neutrality, excitons in quantum rings are sensitive to a magnetic flux. This behaviour is known as the excitonic Aharonov-Bohm effect. It is a fundamental quantum-physical phenomenon that manifests itself in oscillations of both the energy and the oscillator strength of an optical transition depending on the magnetic flux. We present a systematic design process of quantum rings formed by combining compositional radial and axial polytype heterostructures in GaAs/AlAs core-shell nanowires. We focus on the modelling and design aspect and furthermore demonstrate that core-shell GaAs/AlAs nanowires containing atomically flat polytype segments can be systematically tailored for studies of the Aharonov-Bohm effect of neutral and charged excitons.