Abstract
We consider a prototype polyene chain donor-(bridge)-acceptor. The distance between the donor and the acceptor is varied by increasing the number of atoms in the bridge and the rate of electron transfer is studied for a series of different donors , and a fixed acceptor . We observe a large even at a separation of , unexpected from the standard noninteracting theories. Such a long-range electron transfer is primarily due to the formation of bound electron-hole pair (exciton) across the donor-bridge-acceptor atoms. Calculations at various levels, semi-empirical (with inclusion of configuration interactions) and many-body models (using density matrix renormalization group theory), have been performed to accurately account for such electron correlations.
- Received 26 November 2004
DOI:https://doi.org/10.1103/PhysRevB.72.045131
©2005 American Physical Society