Determination of anisotropic dipole moments in self-assembled quantum dots using Rabi oscillations

TL;DR

This study uses polarization-dependent Rabi oscillations to measure and compare the anisotropic dipole moments of excitonic states in a single self-assembled quantum dot, revealing a ratio consistent with the dot's shape elongation.

Contribution

It introduces a method to determine anisotropic dipole moments in quantum dots via Rabi oscillations and correlates these with physical shape anisotropy.

Findings

Dipole moments are anisotropic and nondegenerate.

The ratio of dipole moments matches the quantum dot's elongation ratio.

The method provides a way to probe quantum dot anisotropy.

Abstract

By investigating the polarization-dependent Rabi oscillations using photoluminescence spectroscopy, we determined the respective transition dipole moments of the two excited excitonic states |Ex> and |Ey> of a single self-assembled quantum dot that are nondegenerate due to shape anisotropy. We find that the ratio of the two dipole moments is close to the physical elongation ratio of the quantum dot.