Sequential Tunneling through Molecular Spin Rings

Jörg Lehmann and Daniel Loss
Phys. Rev. Lett. 98, 117203 – Published 14 March 2007

Abstract

We consider electrical transport through molecules with Heisenberg-coupled spins arranged in a ring structure in the presence of an easy-axis anisotropy. The molecules are coupled to two metallic leads and a gate. In the charged state of the ring, a Zener double-exchange mechanism links transport properties to the underlying spin structure. This leads to a remarkable contact-site dependence of the current, which for an antiferromagnetic coupling of the spins can lead to a total suppression of the zero-bias conductance when the molecule is contacted at adjacent sites.

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  • Received 29 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.117203

©2007 American Physical Society

Authors & Affiliations

Jörg Lehmann and Daniel Loss

  • Department of Physics und Astronomy, Universität Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

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Issue

Vol. 98, Iss. 11 — 16 March 2007

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