Far infrared giant dipole resonances in neutral quantum dots

TL;DR

This paper predicts a giant dipole resonance in the far infrared absorption of neutral quantum dots with electron-hole pairs, showing a specific frequency scaling and dominance in absorption.

Contribution

It introduces a theoretical prediction of a giant dipole resonance in quantum dots, with a specific frequency dependence on the number of electron-hole pairs.

Findings

Resonance frequency scales as N^{1/4} for N electron-hole pairs.

Giant Dipole Resonance accounts for over 98% of the absorption sum rule.

Resonance behavior observed in clusters with 2 to 110 pairs.

Abstract

A resonance behaviour of the far infrared absorption probability at a frequency \sim N^{1/4} is predicted for clusters of N electron-hole pairs (2\le N\le 110) confined in disk-shaped quantum dots. For radially symmetric dots, the absorption is dominated by a Giant Dipole Resonance, which accounts for more than 98 % of the energy-weighted photoabsorption sum rule.