Condensed Matter Theory   Universität Basel
Dr. Jörg Lehmann

Sequential Tunneling through Molecular Spin Rings

J. Lehmann and D. Loss

Phys. Rev. Lett. 98, 117203 (2007)

Preprint: arXiv:cond-mat/0608642

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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