Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Electronic structure I

O 69.4: Vortrag

Donnerstag, 17. März 2011, 12:00–12:15, WIL C107

Photoelectron momentum mapping over the whole hemisphere: Experiment and theory for Cu(111), Ag(111), and Cu(001) — •Aimo Winkelmann, Christian Tusche, Martin Ellguth, A. Akin Ünal, Jürgen Henk, and Jürgen Kirschner — MPI für Mikrostrukturphysik, Halle (Saale), Germany

Knowledge of the detailed electronic structure in the entire Brillouin zone and in the whole valence-band regime is a prerequisite for understanding new effects at surfaces. This information is obtained with unprecedented efficiency by an energy- and momentum-resolving photoelectron emission microscope (momentum microscope) that detects constant-energy intensity distributions of electrons emitted into the full hemisphere.

The complete valence-band structure which is accessible by unpolarized He I radiation was mapped for the paradigmatic systems Cu(111), Ag(111), and Cu(001) using the momentum microscope.

The measurements provide simultaneous access to extended parts of the photoelectron momentum space beyond high-symmetry regions and, thus, serve as a testing ground for theoretical photoemission from bulk and surface states. For example, agreement of the experimental and theoretical intensity distributions in the entire phase space is obtained only by improving the treatment of the d-bands which are unsatisfactorily described within the local density approximation.