Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 5: Hauptvortr
äge Ralph / Rellinghaus

MA 5.1: Hauptvortrag

Montag, 24. März 2003, 14:00–14:30, HSZ/04

Quantized energy levels in metal nanoparticles and single molecules — •Dan Ralph — Cornell University

I will describe experiments in which we have used tunneling spectroscopy to measure individual “electron-in-a-box” energy levels in nanometer-scale metal particles. The level spectra do not correspond to free electrons, but rather they are strongly modified by interactions such as spin-orbit coupling, superconducting pairing, magnetic exchange, and magnetic anisotropy forces. One can therefore analyze the spectra to learn about these interactions, in ways analogous to the procedures of atomic or nuclear physics. I will concentrate in this talk on the physics of ferromagnetic metal particles, and on what one can learn from individual quantum states about magnetic anisotropy forces and non-equilibrium electronic excitations. In recent work, we have also extended the experiments to smaller size scales, and can now measure tunneling via one cobalt atom in a single molecule.

This work was done with M. M. Deshmukh, S. Gueron, S. Kleff, J. von Delft, A. N. Pasupathy, J. Park, J. I. Goldsmith, H. D. Abruna, and P. L. McEuen.