Berlin 2008 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 1: Towards Molecular Spintronics

DS 1.3: Hauptvortrag

Montag, 25. Februar 2008, 10:30–11:00, H 2013

Spintronic and electro-mechanical effects in single-molecule transistors — •Maarten R. Wegewijs — Institut für Festkörper-Forschung - Theorie 3, Forschungszentrum Jülich, 52425 Jülich, Germany — Institut für Theoretische Physik A, RWTH Aachen, 52056 Aachen, Germany

The ability to electrically control the current through a single molecule in a three-terminal device geometry has opened up exciting perspectives for single-molecule spintronics. For instance, we predicted transport effects related to the coherent magnetization tunneling in single-molecule magnets which exhibit substantial magnetic anisotropy. In particular, non-trivial Kondo effects allow for a complete determination of the magnetic properties of such a device by transport measurements [1].

Another key feature of single-molecule transistors is the coupling of the electric current to quantized vibrations. In this talk, we will show how internal vibrations of a molecular transistor may be correlated with the total spin. We show how the total spin length may be determined using Franck-Condon transport effects i.e. without using a magnetic field. Finally, we show how electric control of the molecular spin is made possible by current-driven vibrations of the molecule.

[1] M. R. Wegewijs, C. Romeike, H. Schoeller and W. Hofstetter, New J. Phys. 9 344, (2007).