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We consider multiple quantum dots or 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.

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Prof. Dr. Milena Grifoni, University of Regensburg
Seminarraum Theoretische Physik
Contact: not specified