Polarized excitons in nanorings and the `optical' Aharonov-Bohm effect

TL;DR

This paper predicts a novel magnetic-field induced topological phase in polarized excitons confined to semiconductor nanorings, which can significantly influence their optical properties and enable control over photon emission.

Contribution

It introduces a new mechanism for a topological phase in neutral excitons in nanorings, linking magnetic flux to optical state switching.

Findings

Magnetic flux can induce a phase change in excitons in nanorings.

Switching between bright and dark exciton states is possible.

Potential for tailoring photon emission in quantum nanostructures.

Abstract

The quantum nature of matter lies in the wave function phases that accumulate while particles move along their trajectories. A prominent example is the Aharonov-Bohm phase, which has been studied in connection with the conductance of nanostructures. However, optical response in solids is determined by neutral excitations, for which no sensitivity to magnetic flux would be expected. We propose a new mechanism for the topological phase of a neutral particle, a polarized exciton confined to a semiconductor quantum ring. We predict that this magnetic-field induced phase may strongly affect excitons in a system with cylindrical symmetry, resulting in switching between `bright' exciton ground states and novel `dark' states with nearly infinite lifetimes. Since excitons determine the optical response of semiconductors, the predicted phase can be used to tailor photon emission from quantum nanostructures.