Exciton-Polariton Dynamics in Multilayered Materials

TL;DR

This paper develops a 3D mixed-quantum-classical simulation method for exciton-polariton dynamics in multilayered materials, showing enhanced coherence and transport due to synchronized phonon fluctuations.

Contribution

It introduces a novel simulation approach for multilayered materials and demonstrates how multilayering improves quantum coherence and transport properties.

Findings

Multilayered materials extend quantum coherence lifetime compared to single layers.

Synchronization of phonon fluctuations enhances coherence in multilayered structures.

Multilayered systems suppress phonon-induced dynamical disorder, improving transport.

Abstract

Coupling excitons with quantized radiation has been shown to enable coherent ballistic transport at room temperature inside optical cavities. Previous theoretical works employ a simple description of the material, depicting it as a one-dimensional single layer placed in the middle of an optical cavity, thereby ignoring the spatial variation of the radiation field. In contrast, in most experiments, the optical cavity is filled with organic molecules or multiple layers of two-dimensional materials. Here, we develop an efficient mixed-quantum-classical approach, introducing a bright layer description, to simulate the exciton-polariton quantum dynamics in three dimensions. Our simulations reveal that, for the same Rabi splitting, a multilayered material extends the quantum coherence lifetime and enhances transport compared to a single-layer material. We find that this enhanced coherence can be traced to a synchronization of phonon fluctuations over multiple layers, wherein the collective light-matter coupling in a multilayered material effectively suppresses the phonon-induced dynamical disorder.