# Cooperative spontaneous decay of local excitation in a dense and disordered ensemble of point-like impurity atoms near a charged conductive surface

## TL;DR

This paper investigates how a charged conductive surface influences the spontaneous decay and collective emission properties of a dense, disordered atomic ensemble, revealing modifications in decay dynamics and spectral shifts due to surface effects.

## Contribution

It provides a quantum microscopic analysis of how a charged conducting surface alters spontaneous decay and cooperative emission in dense atomic ensembles.

## Key findings

- Electric field modifies the cooperative Lamb shift.
- Surface effects change sub- and superradiant decay behavior.
- Decay dynamics are significantly affected by the proximity to the surface.

## Abstract

On the basis of the general quantum microscopic theory we study the process of spontaneous decay of an excited atom in a dense and disordered ensemble of point-like impurity atoms embedded into transparent dielectric and located near a charged perfectly conducting surface. We have analyzed the simultaneous influence of the modified spatial structure of field modes near the conductive surface and the electric field on the character of interatomic dipoledipole interaction. This leads to the modification of the transition spectrum of an excited atom inside an ensemble and the spontaneous decay dynamics. We have shown that the electric field changes the cooperative Lamb shift, as well as the character of sub- and superradiant decay.