Bridge-mediated Donor-Acceptor Effective Coupling: Exact theoretical description

Details Bridge-mediated Donor-Acceptor Effective Coupling: Exact theoretical description Bridge-mediated Donor-Acceptor Effective Coupling: Exact theoretical description

2005-02-09

arxiv.org/abs/cond-mat/0502242v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, submitted to Europhysics Letters

Scientific paper

An exact expression of the bridge-mediated donor-acceptor effective coupling, is derived. For systems represented by a tight-binding Hamiltonian with nearest-neighbor interactions, we show that the effective coupling, is equal to the product over all square of nearest-neighbor couplings divided by an appropriate product of level spacing of eigen energies of the Hamiltonian. Results of this calculation are compared to those obtained by perturbative approaches and some drawbacks of the latter are pointed out.

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