Transport-Induced Decoherence of the Entangled Triplet Exciton Pair

TL;DR

This paper investigates how exciton hopping in organic crystals causes decoherence in entangled triplet pairs, affecting fluorescence quantum beats, with implications for understanding quantum coherence in molecular systems.

Contribution

It introduces a Monte Carlo analysis of exciton hopping effects on decoherence and quantum beats in triplet pairs, considering magnetic field influences.

Findings

Decoherence can be complete at zero magnetic field due to exciton hopping.

Quantum beats decay rates depend on magnetic field strength.

Hopping rates significantly influence fluorescence quantum beat behavior.

Abstract

Decoherence effects for entangled triplet pairs in organic molecular crystals are analyzed for the case when excitons can hop between inequivalent lattice sites. The fluorescence quantum beats caused by quantum interference upon triplet-triplet recombination into an emissive singlet state are predicted as a function of hopping time and magnetic field based on a Monte Carlo analysis. Depending on exciton hopping rates, it is possible to have complete global decoherence and suppression of fluorescence quantum beats in the limit of zero magnetic field, and to have quantum beats that decay at different rates depending on magnetic field strength.