Engineering quantum dots for electrical control of the fine structure splitting

TL;DR

This study demonstrates that the fine-structure splitting in various quantum dots can be linearly tuned using vertical electric fields, offering insights for optimizing quantum dot properties for quantum information applications.

Contribution

It provides a comprehensive analysis showing linear FSS tuning across different quantum dot systems and offers statistical data to guide future device optimization.

Findings

FSS varies linearly with electric field in all studied quantum dots

The linear tuning behavior is consistent across different growth methods and materials

Statistical parameters can inform strategies to minimize FSS in quantum dots

Abstract

We have studied the variation in fine-structure splitting (FSS) under application of vertical electric field in a range of quantum dots grown by different methods. In each sample we confirm that this energy splitting changes linearly over the field range we can access. We conclude that this linear tuning is a general feature of self-assembled quantum dots, observed under different growth conditions, emission wavelengths and in different material systems. Statistical measurements of characteristic parameters such as emission energy, Stark shift and FSS tuning are presented which may provide a guide for future attempts to increase the yield of quantum dots that can be tuned to a minimal value of FSS with vertical electric field.