title: Vibrational spectroscopy of individual doping centers in a monolayer organic crystal.
abstract: A scanning tunneling microscope (STM) is used to study individual Ag doping centers in a monolayer of C60 molecules supported on a thin Al2O3 film grown on the NiAl(110) surface. Vibronic states of the doping centers are observed with differential conductance (dIdV) spectroscopy. The double-barrier nature of the junction results in bipolar transport: same states participate in charge transport at both bias voltage polarities. Identification of the dIdV features corresponding to bipolar conduction enables a new mode of vibrational spectroscopy with STM.
authors.affiliation: Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA.
authors.forename: G V
authors.initials: GV
authors.lastname: Nazin
authors.forename: X H
authors.initials: XH
authors.lastname: Qiu
authors.forename: W
authors.initials: W
authors.lastname: Ho