Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 48: 2D Materials 1: Electronic Structure of Transition Metal Dichalcogenides

O 48.4: Vortrag

Mittwoch, 7. September 2022, 15:45–16:00, S052

Excitons in TMDC Bilayers — •Jan Nellesen and Michael Rohlfing — Westfälische Wilhelms-Universität, Münster, Germany

Semiconducting Transition-Metal-Dichalcogenides (TMDCs) have gained a lot of attention in the past few years due to possible new applications in optoelectronics. In particular, the excitonic properties of TMDC mono- and bilayers have been studied extensively.
This work focuses on interlayer excitons in TMDC heterostructures which combine large binding energies with relatively long lifespans. The exciton energies are investigated in different systems using the Bethe-Salpeter-Equation.
In order to describe excitons in twisted bilayers, which exhibit long-range moiré structures, ab initio approaches are no longer feasible because of their high computational demand. With the goal of studying excitons in such systems in mind, the TMDC bandstructure is modeled within a tight-binding approximation. For describing the electron-hole interaction, a model potential is used.