A Numerically Exact Description of Ultrafast Vibrational Decoherence in Vibration-coupled Electron Transfer

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2025 Feb 28

PMID 40020191

Authors

Yuanheng Wang

Alfy Benny

Brieuc Le De

Alex W Chin

Gregory D Scholes

Affiliations

Soon will be listed here.

Abstract

Broadband pump-probe spectroscopy has been widely used to measure vibrational decoherence associated with the reaction coordinate in photoinduced ultrafast vibration-coupled electron transfer (VCET) reactions. These experiments provide insight into the interplay of intramolecular coordinates along the reaction coordinate. However, a general theoretical foundation for analyzing, and even for explaining rigorously, these data is lacking. In this work, we study vibrational decoherence in a model VCET reaction using the nearly exact time-dependent density matrix renormalization group simulation method. We explore how analyzing the density matrix with quantum information measures can help elucidate the evolution of vibrational coherence in simulations of dynamics. We examine how vibrational coherence is affected by electron transfer on the timescale of approximately 100 femtoseconds. Our results suggest that electron transfer, in the nonadiabatic model, changes the vibrational equilibrium position abruptly-an example of a "quantum quench" event. This explains the concomitant vibrational decoherence. We find that abrupt vibrational decoherence can be mitigated by wavepacket motion occurring on the timescale of the electron transfer.

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