Condensed Matter Physics Seminar

2 p.m., Thursday, February 6, 2003
Room 1201, Physics Building

Quantum States in Metal Nanoparticles and Single Molecules

Dan Ralph

(Cornell University)

Abstract:  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 and also quantized states in single molecules. In metal particles, the level spectra do not correspond to free electrons, but rather they are modified by the various forces which act on electrons inside metals. I will describe the different consequences of spin-orbit coupling, superconducting pairing, magnetic exchange, and magnetic anisotropy forces. We have also recently succeeded in making single-molecule transistors within junctions formed by electromigration. These devices exhibit many of the same phenomena seen in larger-scale devices, such at Coulomb blockade and the Kondo effect, and they also exhibit new features associated with the coupling of electron tunneling to molecular motion.
Host:  Chris Lobb
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