SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

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

HL 8.2: Talk

Monday, March 27, 2023, 15:15–15:30, POT 81

Giant Enhancement of Interlayer Exciton Luminescence in WSe₂/WSe₂/MoSe₂ in Heterotrilayers. — •Chirag Palekar, Ching-Wen Shih, Imad Limame, Bárbara Rosa, and Stephan Reitzenstein — Institute of Solid State Physics, Technische Universität Berlin, D-10623 Berlin, Germany

TMDC heterolayers have gained lot on interest as a promising platform to study intricate many-body physics phenomena. Here we observe giant enhancement of interlayer exciton PL in a WSe₂/WSe₂/MoSe₂ heterotrilayers (HTL) system prepared by employing exfoliation and dry transfer method. The IX exciton forming at the heterojuction in the HTL region exhibits 10-fold increase in PL yield when compared to HBL region on the same sample. Such an enhancement can be attributed to the close to 0⁰ twist angle between stacked WSe₂ homobilayers providing smaller interlayer separation and hybridization in the WSe₂ band structure, which in turn results in an efficient charge transfer. Further, PLE and reflection contrast reveal the twist angle dependence of the enhancement factor in such type II HTL systems as the large twist angel between WSe₂ homobilayers (57⁰) results in only up to 10% percent enhancement of IX PL in the HTL region when compared with the HBL. This fundamental study of excitons in the HTL system deepens the current understanding of physics of twisted TMDC heterostructures and paves the way for future experiments and theoretical work.