Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 5: Electronic structure I
O 5.5: Vortrag
Montag, 27. März 2006, 12:15–12:30, WIL A317
Visualization of the Molecular Jahn-Teller effect in an insulating K4C60 Monolayer — •Andre Wachowiak1,2, R. Yamachika2, K. H. Khoo2, Y. Wang2, M. Grobis2, D.-H. Lee2, Steven G. Louie2, and M. F. Crommie2 — 1Institute of Applied Physics, University Hamburg, 20355 Hamburg, Germany — 2Department of Physics, University of California at Berkeley, Berkeley, CA, USA
Unlike atoms in an elemental solid, the building blocks of a molecular solid are more susceptible to tuning. C60 based bulk solids can be tuned between metallic, insulating and superconducting states by changing the charge state and/or local environment of the constituent molecules. This flexibility arises through a sensible interplay between intramolecular Coulomb interaction, electron-phonon coupling, and local charging on an energy scale comparable to the narrow electronic bandwidth. By low temperature scanning tunneling microscopy we have examined how molecular electronic structure is strongly influenced due to charge doping and local electron-phonon interaction in extended monolayer films. In particular, the Jahn-Teller effect, a charge-induced mechanical deformation of molecular structure, is directly visualized at the single molecule level in an insulating K4C60 monolayer[1]. [1] A. Wachowiak et al. Science 310 (2005) 468