Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces
DS 18.4: Poster
Dienstag, 26. Februar 2008, 14:30–19:30, Poster A
Identifying the single-molecule spin states by vibronic transport effects — •Felix Reckermann1,2, Maarten R. Wegewijs1,2, and Herbert Schoeller2 — 1Institut für Festkörper-Forschung - Theorie 3, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Institut für Theoretische Physik A, RWTH Aachen, 52056 Aachen, Germany
We show that an electric current through a mixed-valence dimer molecule can detect the spin states of the electronic excitations without external magnetic field. Mixed-valence complexes are molecules in which an excess electron can tunnel between hetero-valent metal ions. This tunneling mediates both a ferromagnetic double-exchange interaction between the ionic spins as well as a non-adiabatic electron-vibration (so called vibronic) interaction.
One has to account for the coupling of the electron motion to the breathing mode of the two ionic ligand-shells as well as the breakdown of the Born-Oppenheimer approximation. The resulting entanglement of the electronic and vibrational degrees of freedom can be detected by a sharp dependence of the differential conductance on the electro-mechanical parameters. Furthermore, the double-exchange coupling of the ionic spins and the vibrational motion become correlated. In a three terminal device geometry, this allows one to identify the spin states of the molecule using the FC-effect.