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HL: Fachverband Halbleiterphysik

HL 8: 2D Materials II (joint session HL/CPP)

HL 8.5: Talk

Monday, March 27, 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.