Regensburg 2010 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
O: Fachverband Oberflächenphysik
O 48: Surface dynamics I
O 48.8: Talk
Wednesday, March 24, 2010, 12:15–12:30, H40
Two-dimensional Fano resonances on Si(100) — •Martin Teichmann1, Christian Eickhoff1,2, Jens Kopprasch1,2, Cornelius Gahl1, and Martin Weinelt1,2 — 1Max-Born-Institut, Max-Born-Straße 2a, 12489 Berlin — 2Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin
Fano resonances have enabled the understanding of many systems, from
atomic to nuclear physics, and in the solid state. We present a
two-dimensional extension of Fano’s theory
for the description of a transition between two
discrete states both degenerate with a continuum. As a model system, we have studied
the surface- and image potential states on Si(100) using two-photon photoemisson. These states
are degenerate with the bulk continuum. Tuning the photon energy reveals
Fano line shapes of the intensity. This allows us to deduce couplings between
surface and bulk states, and to estimate the
lifetime of single hole excitations in an inhomogeneously broadened system.