Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 36: Poster III
HL 36.7: Poster
Wednesday, March 20, 2024, 18:00–20:30, Poster E
Amplification of interlayer exciton emission in twisted WSe2/WSe2/MoSe2 heterotrilayers — •Chirag Palekar1, Paulo E. Faria Junior2, Bárbara Rosa1, Frederico Sousa3, Leandro Malard3, Jaroslav Fabian2, and Stephan Reitzenstein1 — 1Institute of Solid State Physics, Technische Universität Berlin, 10623 Berlin, Germany — 2Institute of Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — 3Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30123-970
Transition metal dichalcogenides (TMDC) heterostructures (HS) obtained by stacking two or more different monolayers (ML) host interlayer excitons (IX) with unique properties that depend on the twist angle and stacking order of MLs. However, IX*s practical applications are limited by the weak oscillator strength, leading a significant reduction in emission. Hence a viable path towards substantially improving the emission of IX is desirable. Here we investigate the twist angle dependent enhancement of IX emission in WSe2/WSe2/MoSe2 heterotrilayer (HTL) systems. The IX exciton formed in the HTL region exhibits a up to 10-fold increase in PL yield compared to HBL region on the same sample [1]. To understand the enhancement of the IX emission, we performed DFT calculations and effective modelling of the low energy IX states. This fundamental study of excitons in HTL system deepens the current understanding of twisted TMDC HSs and paves the way for further experiments, theoretical work and applications. [1] Palekar et al. arXiv:2311.02509,2023
Keywords: TMDC Heterotrilayer; Interlayer exciton enhancement