Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: 2D Materials: Electronic Structure and Exitations I (joint session O/HL/TT)
TT 20.10: Vortrag
Dienstag, 18. März 2025, 12:45–13:00, H8
Resonant Photoemission Studies of Transition Metal Sulfides and Selenides — •Yashasvi Mehra1,2,3, Samuel Beaulieu4, Mauro Faniculli1,2, Olivier Heckmann1,2, Karol Hricovini1,2, Aki I.O. Pulkkinen3, Jan Minar3, and Maria Christine Richter1,2 — 1Université Paris-Saclay, CEA, LIDYL, Gif-sur-Yvette, France — 2CY Cergy Paris Université, CEA, LIDYL, Gif-sur-Yvette, France — 3University of West Bohemia, NTC, Pilsen, Czech Republic — 4Universite de Bordeaux CNRS CEA, CELIA, UMR5107, F33405 Talence, France
By performing resonant ARPES measurements and SPR-KKR photoemission calculations on Transition Metal Selenide, Sulfide and the Vanadium intercalated NbS2 systems, we study the interplay between different decay mechanisms in resonant conditions, radiation-less Raman Auger and Classical Auger emissions. Through a method proposed by Cini and Sawatzky we can determine the on-site Coulomb interaction per element in some cases. On the theoretical front the calculations are performed using the SPR-KKR method, which is based on one-step model, that incorporates the effect of all matrix elements which accounts for the photoemission process. Furthermore, we analyze calculated ARPES, XAS, element and orbital resolved band structure underlining agreement with experimental results and helping with its interpretation.
Keywords: Transition Metal Dichalcogenides; Resonant Photoemission; Radiationless resonant Raman Auger process; Coulomb energy; ARPES