SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 85: Electronic Structure of Surfaces II
O 85.2: Talk
Thursday, March 30, 2023, 15:15–15:30, REC C 213
Black Phosphorus and the Free-Electron Final-State Assumption in Photoemission Spectroscopy — •Charlotte Sanders1, Klara Volckaert2, Deepnarayan Biswas3, Marco Bianchi2, Philip Hofmann2, and Irene Aguilera4 — 1Central Laser Facility, STFC Rutherford Appleton Lab, Research Complex @ Harwell, OX11 0QX, UK — 2Dept. of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus-C, DK — 3Diamond Light Source, Division of Science, Didcot, OX11 0DE, UK — 4Institute for Theoretical Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, NL
In the photoemission process, the in-plane component (kx,ky) of the electron wave vector is conserved; but the kz component is not, due to breaking of out-of-plane symmetry at the surface. This fact complicates analysis of photoemission spectra from kz-dispersing states.
Bulk black phosphorus has a kz-dispersing state that has been the subject of several studies wherein photoemission intensity close to the Fermi level resists interpretation on the basis of simple free-electron-like final-state assumptions. Experimental spectra have been interpreted in terms of surface resonances, or of complexities in the final state that go beyond the free-electron assumption. Here we present experimental and theoretical results concerning the latter interpretation; and, we consider the fundamental meaning of the free-electron-like final-state.