Effects of spatial quantization and Rabi-shifted resonances in single and double excitation of quantum wells and wires induced by few-photon optical field

TL;DR

This paper presents a quantum theoretical model for exciton and bi-exciton dynamics in quantum wells and wires under few-photon excitation, revealing Rabi oscillations, Rabi-shifted resonances, and the effects of spatial quantization.

Contribution

It introduces a comprehensive quantum approach to analyze exciton-photon interactions in finite-sized quantum systems, highlighting new Rabi-shifted resonance phenomena.

Findings

Identification of Rabi-like oscillations due to spatial quantization

Discovery of Rabi-shifted resonances affecting excitation dynamics

Enhanced excitation of states near the upper polariton branch

Abstract

We develop a fully quantum theoretical approach which describes the dynamics of Frenkel excitons and bi-excitons induced by few photon quantum light in a quantum well or wire (atomic chain) of finite size. The eigenenergies and eigenfunctions of the coupled exciton-photon states in a multiatomic system are found and the role of spatial confinement as well as the energy quantization effects in 1D and 2D cases is analyzed. Due to the spatial quantization, the excitation process is found to consist in the Rabi-like oscillations between the collective symmetric states characterized by discrete energy levels and arising in the picture of the ladder bosonic operators. At the same time, the enhanced excitation of additional states with energy close to the upper polariton branch is revealed. The found new effect is referred to as the formation of Rabi-shifted resonances and is analyzed in details. Such states are shown to influence dramatically on the dynamics of excitation especially in the limit of large times.