Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Focus Session "Spins in Organic Materials I" (jointly with DS)

MA 33.1: Topical Talk

Mittwoch, 16. März 2011, 11:00–11:30, GER 37

Selective spin-blockade in interacting molecular interferometers — •Milena Grifoni, Andrea Donarini, and Georg Begemann — Institut für Theoretische Physik, Universität Regensburg, Regensburg, Germany

We consider molecular junctions in the single-electron tunneling regime which, due to a high degree of spatial symmetry, have a degenerate many-body spectrum. As a consequence, interference phenomena which cause a current blocking can occur at specific values of the bias and gate voltage. We present here necessary and sufficient conditions for interference blockade also in the presence of spin-polarized leads. As an example we analyze a benzene single-electron transistor. For a setup with parallel polarized leads, we show how to exploit the current blocking to selectively prepare the system in a defined spin state without application of any external magnetic field.

References:

A. Donarini, G. Begemann and M. Grifoni, Nano Lett. 9, 2897 (2009)

A. Donarini, G. Begemann and M. Grifoni, Phys. Rev. B 82, 125451 (2010)