SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: 2D Materials II (joint session HL/CPP)
CPP 15.5: Vortrag
Montag, 27. März 2023, 16:15–16:30, POT 81
Theoretical description of interlayer excitons in TMD homobilayers — •Ruven Hübner1, Alexander Steinhoff1, and Matthias Florian2 — 1Institut für Theoretische Physik, Universität Bremen, Bremen, Germany — 2University of Michigan, Dept. of Electrical Engineering and Computer Science, Ann Arbor, MI, USA
In recent years, interlayer excitons in bilayers of transition metal dichalcogenides (TMDs) have received a rapid increase in attention. On the one hand, they feature the main characteristics of conventional excitons in the corresponding monolayers, namely an absorption spectrum in the optical regime combined with a high binding energy. On the other hand, they differ to such intralayer excitons by a massively increased life time, a non-zero dipole moment in the out-of-plane direction and a strong sensitivity to material combination as well as stacking arrangement of adjacent monolayers. In this talk we focus on special excitonic properties inside TMD homobilayers that are particularly demanding from a theoretical point of view. In this context we discuss moiré excitons in twisted bilayers as well as high-lying excitons and trions at around twice the band gap energy arising within a highly non-parabolic band dispersion.