Aharonov-Bohm signature for neutral excitons in type-II quantum dot ensembles

TL;DR

This study demonstrates Aharonov-Bohm oscillations in neutral excitons within type-II quantum dots, revealing quantum interference effects typically associated with charged particles, through magnetophotoluminescence measurements.

Contribution

It provides experimental evidence of Aharonov-Bohm effects for neutral excitons in type-II quantum dots, supported by a simple theoretical model matching structural parameters.

Findings

Observation of AB oscillations for neutral excitons

Change in hole angular momentum from 0 to 1, 2, 3

Model parameters align with structural data

Abstract

It is commonly believed that the Aharonov-Bohm (AB) effect is a typical feature of the motion of a charged particle interacting with the electromagnetic vector potential. Here we present a magnetophotoluminescence study of type-II InP/GaAs self-assembled quantum dots, unambiguously revealing the Aharonov-Bohm-type oscillations for neutral excitons when the hole ground state changes its angular momentum from lh = 0 to lh = 1, 2, and 3. The hole ring parameters derived from a simple model are in excellent agreement with the structural parameters for this system.