Kondo excitons in self-assembled quantum dots

TL;DR

This paper introduces novel Kondo excitons in self-assembled quantum dots, demonstrating how their optical spectra are affected by Fermi sea interactions and the Kondo effect, with potential implications for quantum dot optoelectronics.

Contribution

It presents a new theoretical framework for Kondo excitons in quantum dots, highlighting their unique optical properties influenced by Fermi sea interactions and the Kondo effect.

Findings

Photoluminescence lines depend strongly on vertical bias.

Kondo effect causes distinctive line shapes with temperature-dependent widths.

Fermi sea interaction enables novel excitonic states in quantum dots.

Abstract

We describe novel excitons in quantum dots by allowing for an interaction with a Fermi sea of electrons. We argue that these excitons can be realized very simply with self-assembled quantum dots, using the wetting layer as host for the Fermi sea. We show that a tunnel hybridization of a charged exciton with the Fermi sea leads to two striking effects in the optical spectra. First, the photoluminescence lines become strongly dependent on the vertical bias. Secondly, if the exciton spin is nonzero, the Kondo effect leads to peculiar photoluminescence line shapes with a line width determined by the Kondo temperature.