Giant optical anisotropy in a single InAs quantum dot in a very dilute quantum-dot ensemble

TL;DR

This paper reports the discovery of significant optical anisotropy in single InAs quantum dots, with polarization ratios reaching up to 82%, highlighting an intrinsic property of dilute quantum-dot ensembles.

Contribution

The study provides the first systematic experimental evidence of giant optical anisotropy as an intrinsic feature of dilute quantum-dot arrays.

Findings

Polarization ratios up to 82% observed in single quantum dots

Giant optical anisotropy is consistent across different laboratories

Anisotropy varies significantly between individual quantum dots

Abstract

We present the experimental evidence of giant optical anisotropy in single InAs quantum dots. Polarization-resolved photoluminescence spectroscopy reveals a linear polarization ratio with huge fluctuations, from one quantum dot to another, in sign and in magnitude with absolute values up to 82%. Systematic measurements on hundreds of quantum dots coming from two different laboratories demonstrate that the giant optical anisotropy is an intrinsic feature of dilute quantum-dot arrays.