title: Sequential tunneling through molecular spin rings.
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.
authors.affiliation: Department of Physics und Astronomy, Universität Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
authors.forename: Jörg
authors.initials: J
authors.lastname: Lehmann
authors.forename: Daniel
authors.initials: D
authors.lastname: Loss