SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 3: Poster Session I

HL 3.9: Poster

Monday, September 27, 2021, 10:00–13:00, P

Back Focal Plane Imaging of Interlayer Excitons in WSe₂/MoSe₂ Heterostructures — •Lukas Sigl¹, Mirco Troue¹, Mauro Brotons-Gisbert², Brian Gerardot², Ursula Wurstbauer³, and Alexander Holleitner¹ — ¹TU Munich, Germany — ²Heriot-Watt University, United Kingdom — ³University of Münster, Germany

Transition metal dichalcogenide monolayers exhibit strong light-matter interactions, which promotes them as ideal candidates for novel 2D optoelectronic applications. A vertical stacking into van der Waals heterostacks leads to the formation of long-lived interlayer excitons in adjacent layers.

We experimentally determine the transition dipole orientation of interlayer excitons in WSe₂/MoSe₂ heterobilayers at a base temperature of 1.7 K. The far-field photoluminescence is observed in the back focal plane of a microscope objective, such that the angular emission pattern can be resolved. An analytical model, based on source terms and transfer matrices, provides an accurate description of the dipole radiation from the heterobilayers. The obtained dipole orientation gives insight into the nature of interlayer exciton transitions and coincides with theoretical calculations for the ground state configurations in R- and H-type heterobilayers.