Internal Photo Effect from a Single Quantum Emitter

TL;DR

This paper demonstrates an internal photo-effect in a single quantum dot, showing electron emission via intra-band excitation, with tunable emission rates, revealing a process similar to atomic photo ionization in solid-state systems.

Contribution

It provides the first observation of intra-band photo-ionization in a solid-state quantum emitter, quantifies the process, and discusses its implications for quantum device coherence.

Findings

Emission rate linearly depends on excitation intensity

Emission tunable over several orders of magnitude

Identifies a fundamental limit to coherence times in quantum devices

Abstract

We demonstrate by time-resolved resonance fluorescence measurements on a single self-assembled quantum dot an internal photo-effect that emits electrons from the dot by an intra-band excitation. We find a linear dependence of the optically generated emission rate on the excitation intensity and use a rate equation model to deduce the involved rates. The emission rate is tunable over several orders of magnitude by adjusting the excitation intensity. Our findings show that a process that is well known in single atom spectroscopy (i.e. photo ionization) can also be observed in the solid state. The results also quantify an important, but mostly neglected, mechanism that may fundamentally limit the coherence times in solid-state quantum optical devices.