Superradiance of low density Frenkel excitons in a crystal slab of three-level atoms: Quantum interference effect

TL;DR

This paper investigates the superradiant fluorescence and quantum interference effects of low density Frenkel excitons in a crystal slab of three-level atoms, revealing collective excitonic behaviors and quantum beat phenomena.

Contribution

It introduces a symmetric quasi-spin SU(3) framework for modeling collective excitations in V-type three-level atoms and analyzes quantum coherence effects beyond the rotating wave approximation.

Findings

Identification of superradiance in low density Frenkel excitons

Observation of quantum beat phenomena in excitonic states

Analytical results including self-interaction effects

Abstract

We systematically study the fluorescence of low density Frenkel excitons in a crystal slab containing $N_T$ V-type three-level atoms. Based on symmetric quasi-spin realization of SU(3) in large $N$ limit, the two-mode exciton operators are invoked to depict various collective excitations of the collection of these V-type atoms starting from their ground state. By making use of the rotating wave approximation, the light intensity of radiation for the single lattice layer is investigated in detail. As a quantum coherence effect, the quantum beat phenomenon is discussed in detail for different initial excitonic states. We also test the above results analytically without the consideration of the rotating wave approximation and the self-interaction of radiance field is also included.