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TT: Fachverband Tiefe Temperaturen
TT 31: 2D Materials II: Electronic Structure (joint session O/TT)
TT 31.4: Talk
Tuesday, March 19, 2024, 11:30–11:45, MA 005
Evolution of band structure in 2D Transition Metal Dichalcogenide alloy MoxW1−xSe2 — •Sarath Sasi1, Laurent Nicolaï1, Aki Pulkkinen1, Christine Richter2,3, Karol Hricovini2,3, and Ján Minár1 — 1New Technologies Research Centre, University of West Bohemia, Pilsen, Czech Republic — 2LPMS, CY Cergy Paris Université, Neuvillesur- Oise, France — 3Université Paris-Saclay, CEA, CNRS, LIDYL, Gif-sur-Yvette, France
In the realm of two-dimensional (2D) materials research, transition metal dichalcogenides (TMDCs) have emerged as significant subjects, especially WSe2 and MoSe2, which are notable for their similar band structures. Our research aims to explore the band structure evolution in MoxW1−xSe2 alloys (x= 0 to 1) utilizing a blend of Angle-Resolved Photoemission Spectroscopy (ARPES) experimentally and its complementary theoretical one-step model photoemission calculations employing the SPR-KKR package [1]. Furthermore, circular dichroism [2] ARPES measurements provide an insight into the orbital characteristics, revealing Mo concentration-dependent effects that are substantiated through photoemission calculations using the coherent potential approximation(CPA). For homogeneous random alloys, CPA effectively models average scattering properties and, within the KKR formalism, ensures no extra scattering when embedding an alloy component. Studying these systems with inherent disorders uncovers fundamental insights, enhancing their potential applications.
[1]Braun, J., Minar, J., Ebert, H. (2018). Physics Reports, 740.
[2]Beaulieu, S. et al . (2020). Physical Review Letters, 125(21).
Keywords: 2D materials; ARPES; Electronic structure; TMDC; Spectroscopy