Many-body dynamics of the decay of excitons of different charges in a quantum dot

TL;DR

This paper investigates the many-body dynamics in quantum dots during exciton decay, revealing complex spectral features linked to quantum quenches and Anderson orthogonality catastrophe, with implications for understanding excitonic states.

Contribution

It provides a theoretical analysis of the photoluminescence spectrum considering many-body effects and quantum quenches in quantum dots, explaining experimental observations.

Findings

Spectral features explained by many-body quantum quenches.

Identification of Anderson orthogonality catastrophe effects.

Analysis of excitonic state transitions under varying conditions.

Abstract

We calculate the photoluminescence spectrum of a single semiconductor quantum dot strongly coupled to a continuum as a function of light frequency, gate voltage, and magnetic field. The spectrum is dominated by the recombination of several excitonic states which can be considered as quantum quenchs in which the many-body nature of the system is suddenly changed between initial and final states. This is associated with an Anderson orthogonality catastrophe with a power-law singularity at the threshold. We explain the main features observed experimentally in the region of stability of the trion $X^-$, the neutral exciton $X^0$ and the gate voltage induced transition between them.