# Quantum Emitters in Two-dimensional Structured Reservoirs in the Non-Perturbative Regime

## TL;DR

This paper explores the complex quantum dynamics of quantum emitters coupled to a two-dimensional structured reservoir, revealing non-perturbative effects like directional emission and perfect subradiance, which are not captured by traditional models.

## Contribution

It introduces a non-perturbative analysis of quantum emitters in 2D reservoirs, uncovering novel phenomena such as directional emission and subradiance.

## Key findings

- Exponential relaxation with non-Golden rule rate
- Directional emission into the reservoir
- Perfect subradiance for four emitters

## Abstract

We show that the coupling of quantum emitters to a two-dimensional reservoir with a simple band structure gives rise to exotic quantum dynamics with no analogue in other scenarios and which can not be captured by standard perturbative treatments. In particular, for a single quantum emitter with its transition frequency in the middle of the band we predict an exponential relaxation at a rate different from that predicted by the Fermi's Golden rule, followed by overdamped oscillations and slow relaxation decay dynamics. This is accompanied by directional emission into the reservoir. This directionality leads to a modification of the emission rate for few emitters and even perfect subradiance, i.e., suppression of spontaneous emission, for four quantum emitters.