Multi-Excitons in Flexible Rydberg Aggregates

TL;DR

This paper explores multi-exciton states in flexible Rydberg aggregates, revealing complex dynamical behaviors like exciton collisions and routing, which enhance their potential for quantum simulation of molecular dynamics.

Contribution

It introduces the study of multi-exciton states in flexible Rydberg aggregates, including their decomposition and dynamical phenomena such as collisions and non-adiabatic effects.

Findings

Multi-exciton states can be decomposed into single exciton states.

Exciton-exciton collisions and routing are demonstrated.

Strong non-adiabatic effects are observed in one-dimensional models.

Abstract

Flexible Rydberg aggregates, assemblies of few Rydberg atoms coherently sharing electronic excitations while undergoing directed atomic motion, show great promise as quantum simulation platform for nuclear motional dynamics in molecules or quantum energy transport. Here we study additional features that are enabled by the presence of more than a single electronic excitation, thus considering multi-exciton states. We describe cases where these can be decomposed into underlying single exciton states and then present dynamical scenarios with atomic motion that illustrate exciton-exciton collisions, exciton routing, and strong non-adiabatic effects in simple one-dimensional settings.