Quantum transport through single-molecule junctions with orbital degeneracies

Maximilian G. Schultz
Phys. Rev. B 82, 155408 – Published 6 October 2010

Abstract

We consider electronic transport through a weakly coupled single-molecule junction, where the molecule has a degenerate electronic spectrum being linearly coupled to an internal vibrational mode. As for such molecules, a rate-equation description in the weak-coupling limit is not possible, we investigate the interplay of the coherent physics caused by the off-diagonal elements of the reduced density matrix with the molecular vibrations. We identify two distinct molecular models and provide an in-depth discussion of their properties on the Hamiltonian level, their transport characteristics for weak and strong electron-phonon coupling and different parameter regimes. We finally extend our reasoning to the cases, when the orbital degeneracy is slightly broken and the leads have more than one electronic mode.

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  • Received 21 April 2010

DOI:https://doi.org/10.1103/PhysRevB.82.155408

©2010 American Physical Society

Authors & Affiliations

Maximilian G. Schultz*

  • Department of Physics, University of Basel, Klingelbergstr. 82, 4056 Basel, Switzerland

  • *maximilian.schultz@unibas.ch

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Issue

Vol. 82, Iss. 15 — 15 October 2010

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