Characterization of the Shell Structure in Coupled Quantum Dots through Resonant Optical Probing

TL;DR

This paper introduces a technique for visualizing photoluminescence excitation in coupled quantum dots, enabling detailed characterization of their shell structure and interactions, which is crucial for quantum information processing.

Contribution

It presents a novel visualization method for photoluminescence excitation in coupled quantum dots, facilitating the analysis of their interaction and shell structure.

Findings

Technique effectively reveals dot interactions and absorption/emission processes

Characterization of hole shell structure in coupled quantum dots

Comparison with Level Anti-Crossing Spectroscopy validates the method

Abstract

Excited states in single quantum dots (QDs) have been shown to be useful for spin state initialization and manipulation. For scalable quantum information processing it is necessary to have multiple spins interacting. Therefore, we present initial results from photoluminescence excitation studies of excited states in coupled quantum dots (CQDs). Due to the rich set of possible excitation and recombination possibilities, a technique for visualizing photoluminescence excitation in coupled quantum dots is discussed, by which both the interaction between the dots and the type of absorption and emission that generated the photoluminescence is easily and clearly revealed. As an example, this technique is applied to characterize the shell structure of the hole in the top dot and the results are compared with those using Level Anti-Crossing Spectroscopy (LACS).