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O: Fachverband Oberflächenphysik
O 59: Electronic Structure of Surfaces I
O 59.5: Talk
Wednesday, March 29, 2023, 16:15–16:30, REC C 213
Spectroscopic evidence for a new type of surface resonance at noble-metal surfaces — •Tobias Eul1, Jürgen Braun2, Benjamin Stadtmüller1,3, Hubert Ebert2, and Martin Aeschlimann1 — 1Technische Universität Kaiserslautern and Research Center OPTIMAS, 67663 Kaiserslautern, Germany — 2Department Chemie, Ludwig-Maximilians-Universität München, 81377 München, Germany — 3Institute of Physics, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
We investigated the surface and bulk properties of the pristine (110) surface of silver using threshold photoemission by excitation with light of 5.9 eV. Using a momentum microscope, we identified two distinct transitions along the ΓY-direction of the crystal. The first one is a so far unknown surface resonance of the (110) noble-metal surface, exhibiting an exceptionally large bulk character that has so far been elusive in surface sensitive experiments. The second one stems from the well-known bulklike Mahan cone oriented along the ΓL-direction inside the crystal but projected onto the (110)-surface cut. The existence of the new state is confirmed by photocurrent calculations, and its character is analyzed.