Direct Observation of Lateral Coupling Between Self-Assembled Qauntum Dots

TL;DR

This study provides direct experimental evidence of lateral coupling and carrier scattering between self-assembled quantum dots, revealing complex interdot interactions mediated by localized states below the barrier band edge.

Contribution

First direct observation of lateral coupling between self-assembled quantum dots using near-field photoluminescence excitation spectroscopy.

Findings

Carrier scattering occurs between spatially separated quantum dots.

Excitation spectra show persistent continuum and narrow resonances.

Interdot scattering is evidenced by simultaneous resonances in multiple dots.

Abstract

Scattering of carriers between spatially separated zero dimensional states has been observed in a system of self-assembled In_{0.55}Al_{0.45}As quantum dots. We believe the interdot tunneling is mediated by localized states below the barrier band edge. The experiment was performed by taking photoluminescence excitation spectra at 4.2K using a near-field scanning optical microscope. Surprisingly, the excitation spectrum from individual dots does not quench to zero at any energy, even when the energy of the exciting light is tuned below the barrier band edge. On top of this continuum, narrow resonances are observed in the emission lines of individual dots. These resonances tend to occur simultaneously in several emission lines, originating from different quantum dots, evincing interdot scattering.