Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 76: Electronic structure of surfaces: Spectroscopy, surface states II
O 76.5: Vortrag
Donnerstag, 12. März 2026, 11:30–11:45, HSZ/0201
Studying the polar surfaces of MAX and MAB phases using µ-ARPES — •Gesa Siemann1, Gianmarco Gatti1, Amalie Svaneborg5, Wu Bing4, Anders S. Mortensen1, Charlotte Sanders2, Naina Kushwaha2,6, Jenny Rigden2, Yu Zhang2, Matthew D. Watson3, Kristian Thygesen5, Zdeněk Sofer4, and Philip Hofmann1 — 1Department of Physics and Astronomy, Aarhus University, DK — 2Central Laser Facility, Harwell, UK — 3Diamond Light Source, UK — 4University of Chemistry and Technology Prague, CZE — 5Department of Physics, Technical University of Denmark, Lyngby, DK — 6School of Physics and Astronomy, St Andrews University, UK
Natural heterostructures with interlayer charge transfer in the bulk can exhibit distinctive surface effects when this transfer is interrupted, such as Rashba splitting and itinerant ferromagnetism, both absent in the bulk. These layered systems therefore provide a platform to study how charge redistribution and symmetry breaking shape the emerging surface electronic structure. Here, we introduce MAX and MAB phases as a promising material family to host similar effects due to their alternating MX and A layers. After cleaving the samples, we used photoemission experiments with a micrometer-scale light spot (µ-ARPES), allowing us to reliably distinguish different surface terminations and their electronic structures. This work furthermore explores how covalency and metallicity govern charge transfer, and thus the surface electronic properties, in layered compounds.
Keywords: ARPES; MAX phases; MAB phases; heterostructures