Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Transport: Nanoelectronics III - Molecular Electronics
TT 23.6: Vortrag
Mittwoch, 25. März 2009, 10:45–11:00, HSZ 105
Spin-Vibration Coupling and Kondo Effect in Transport through Single-Molecule Magnets — •Falk May1, Maarten R.Wegewijs2, and Walter Hofstetter1 — 1Institut für Theoretische Physik,J. W. Goethe-Universität, D-60438 Frankfurt, Germany — 2Institut für Theoretische Physik, Lehrstuhl A, RWTH Aachen, D-52056 Aachen, Germany
We study transport properties of a single-molecule magnet (SMM) strongly coupled to electronic leads in the low temperature limit using the numerical renormalization group. These molecules can be charac-terized by a large spin and magnetic anisotropies arising from spin-orbit coupling of magnetic ions and ligand field effects. We address the important question of the coupling of the spin to a localized molecular vibration, which can also be anisotropic. We find a rich interplay with effects of intrinsic quantum spin-tunneling, responsible for the Kondo effect in such systems [1], for example a Kondo resonance induced solely by zero-point quantum vibrations.
[1] C. Romeike et al., Phys. Rev. Lett. 96, 19 (2006)