Quantum Transport through Nanostructures with Orbital Degeneracies

Abstract

Geometric symmetries cause orbital degeneracies in a molecule's spectrum. In a single-molecule junction, these degeneracies are lifted by various symmetry-breaking effects. We study quantum transport through such nanostructures with an almost degenerate spectrum. We show that the master equation for the reduced density matrix must be derived within the singular-coupling limit as opposed to the conventional weak-coupling limit. This results in signatures of the density matrix's off-diagonal elements in the transport characteristics.

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• Rate equations for Coulomb blockade with ferromagnetic leads
• A benzene interference single-electron transistor
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