Electron Transfer in Donor-Acceptor Systems: Many-Particle Effects and Influence of Electronic Correlations

TL;DR

This paper explores how many-particle effects and electronic correlations influence electron transfer in donor-acceptor systems, revealing differences between single- and two-particle behaviors and identifying conditions for Coulomb-assisted transfer.

Contribution

It introduces a non-perturbative numerical approach to analyze many-particle effects and Coulomb interactions in electron transfer, providing new insights into the role of electronic correlations.

Findings

Distinct differences between single- and two-particle transfer characteristics.

Critical electron-boson coupling alpha_c depends on Coulomb interaction U.

Evidence for many-particle and Coulomb-assisted transfer mechanisms.

Abstract

We investigate electron transfer processes in donor-acceptor systems with a coupling of the electronic degrees of freedom to a common bosonic bath. The model allows to study many-particle effects and the influence of the local Coulomb interaction U between electrons on donor and acceptor sites. Using the non-perturbative numerical renormalization group approach we find distinct differences between the electron transfer characteristics in the single- and two-particle subspaces. We calculate the critical electron-boson coupling alpha_c as a function of $U$ and show results for density-density correlation functions in the whole parameter space. The possibility of many-particle (bipolaronic) and Coulomb-assisted transfer is discussed.