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HL: Fachverband Halbleiterphysik

HL 18: 2D Materials and Heterostructures: Emerging Materials and Phenomena

HL 18.3: Talk

Tuesday, March 19, 2024, 10:00–10:15, EW 201

On-site Coulomb energy in TMDC compounds — •Yashasvi Mehra^1,2,3, Samuel Bealieu⁴, Mauro Fanciulli^1,2, Olivier Heckmann^1,2, Karol Hricovini^1,2, Marcin Rosmos⁵, Natalia Olszowska⁵, Aki Ismo Olavi Pulkkinen³, Jan Minar³, and Maria Christine Richter^1,2 — 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 — ⁴Université de Bordeaux, CNRS, CEA, CELIA, UMR5107, Talence, France — ⁵SOLARIS National Synchrotron Radiation Centre, Jagiellonian University, Krakow, Poland

The Coulomb interaction U, serves as a pivotal parameter influencing electron behavior, particularly accentuated within low-dimensional materials. Transition Metal Dichalcogenides, quasi-2-D systems, exhibit diverse electronic traits like CDW order, co-existing CDW with superconductivity, and topologically non-trivial phases. Their 2D nature intensifies electron-coulomb interaction, leading to phenomena like Mott-Hubbard transitions. We aim to determine the on-site Coulomb interaction for each element within two series of TMDC materials (MX2, where X = S, Se, Te, M = Nb, Ta) by resonant ARPES.

Keywords: Transition Metal Dichalcogenides; Resonant Photoemission; Charge Density Wave; Coulomb energy