High resolution spectroscopy and narrow resonances from InGaN quantum dots in GaN nanowires

TL;DR

This study demonstrates high-resolution nonlinear optical spectroscopy of InGaN quantum dots in GaN nanowires, revealing atom-like resonances that persist at room temperature, suggesting potential for excitonic applications without cryogenic cooling.

Contribution

It provides the first detailed observation of atom-like resonances in InGaN quantum dots at room temperature using nonlinear spectroscopy.

Findings

Atom-like resonances observed at low temperature.

Nonlinear signals persist strongly at room temperature.

Potential for excitonic applications without cryogenics.

Abstract

High resolution coherent nonlinear optical spectroscopy of an ensemble of red-emitting InGaN quantum dots in GaN nanowires is reported. The data show a pronounced atom-like interaction between resonant laser fields and quantum dot excitons at low temperature that is difficult to observe in the linear absorption spectrum due to inhomogeneous broadening from indium fluctuation effects. We find that the nonlinear signal persists strongly at room temperature. The robust atom-like room temperature response indicates the possibility that this material could serve as the platform for proposed excitonic based applications without the need of cryogenics.