Zero-phonon linewidth and phonon satellites in the optical absorption of nanowire-based quantum dots

TL;DR

This paper theoretically investigates how the one-dimensional phonon spectrum of nanowire-based quantum dots affects their optical absorption, revealing modifications like satellite peaks and a finite zero-phonon linewidth.

Contribution

It provides a theoretical analysis of the optical absorption features of quantum dots in nanowires, highlighting the impact of the nanowire phonon spectrum on excitonic absorption.

Findings

Presence of phonon satellites in absorption spectra

Finite zero-phonon linewidth in lowest-order calculations

Modification of optical properties due to nanowire geometry

Abstract

The optical properties of quantum dots embedded in a catalytically grown semiconductor nanowire are studied theoretically. In comparison to dots in a bulk environment, the excitonic absorption is strongly modified by the one-dimensional character of the nanowire phonon spectrum. In addition to pronounced satellite peaks due to phonon-assisted absorption, we find a finite width of the zero-phonon line already in the lowest-order calculation.