Surface-state depopulation on small Ag(111) terraces.
The dependence of the local density of states near the Fermi energy E(F) on the width of terraces T is investigated by tunneling scanning spectroscopy on Ag(111) at 7 K. With decreasing T, the electronic density in the occupied surface state shifts monotonically towards E(F), leading to a depopulation at T=3.2 nm in quantitative agreement with a Fabry-Pérot model. Depopulation coincides with a switch from confinement by terrace modulation to step modulation.
Morgenstern
Karina
K
Institut für Experimentalphysik, FB Physik, Freie Universität Berlin, Arnimallee 14, Germany.
Braun
Kai-Felix
KF
Rieder
Karl-Heinz
KH