Seminars Archive
Angle-resolved study of C60 monolayers over Ag substrates
Abstract
Wednesday, January 19, 2005, 11:00
Seminar Room, ground floor, Building "T"
Sincrotrone Trieste, Basovizza
Angle-resolved study of C
60
monolayers over Ag substrates
V. Brouet
(Laboratoire de physique des Solides, Universit Paris-Sud,
Orsay, France)
Abstract
Electrons can easily be transferred from alkali ions to the lowest
unoccupied molecular level of the C60 molecule. In the solid state, this
creates a family of compounds with interesting properties from the fundamental
point of view, because their narrow band yield strong electronic correlations
and some degrees of freedom of the C60 molecule (for example phonons) have
unusual values. In bulk compounds, superconductivity has been discovered
in 1991 in A3C60, up to 32 K. I will present direct measurements of the
band dispersion with angle resolved photoemission in the case of monolayers
KxC60/Ag(111) and KxC60/Ag(100). These studies evidence a high sensitivity
of the band structure to small structural modifications, like relative
orientations of C60, and anomalies as a function of doping.
These results have been obtained at the Advanced Light Source (Berkeley)
during a stay in the group of Z.-X. Shen.
