Coherent transient exciton transport in disordered polaritonic wires

TL;DR

This paper investigates how strong light-matter interactions influence coherent exciton wave packet dynamics in disordered polaritonic wires, revealing how disorder and polariton dispersion affect exciton mobility and transport efficiency.

Contribution

It introduces the concept of effective exciton group velocity derived from polariton dispersion and analyzes its role in exciton transport under varying disorder conditions.

Findings

Early wave packet spread velocity depends on initial exciton momentum and effective group velocity.

Stronger disorder diminishes the influence of initial state, enhancing the role of cavity red-shifts.

Guidelines for optimizing ultrafast exciton transport based on disorder and dispersion are provided.

Abstract

Excitation energy transport can be significantly enhanced by strong light-matter interactions. In the present work, we explore intriguing features of coherent transient exciton wave packet dynamics on a lossless disordered polaritonic wire. Our main results can be understood in terms of the effective exciton group velocity, a new quantity we obtain from the polariton dispersion. Under weak and moderate disorder, we find that the early wave packet spread velocity is controlled by the overlap of the initial exciton momentum distribution and its effective group velocity. Conversely, when disorder is stronger, the initial state is nearly irrelevant, and red-shifted cavities support excitons with greater mobility. Our findings provide guiding principles for optimizing ultrafast coherent exciton transport based on the magnitude of disorder and the polariton dispersion. The presented perspectives may be valuable for understanding and designing new polaritonic platforms for enhanced exciton energy transport.