Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 11: 2D Materials 2 (joint session HL/CPP/DS)
HL 11.9: Talk
Monday, September 5, 2022, 17:30–17:45, H36
Photonic and Phononic Couplings in Hybrid High-Q Nanocavities with Encapsulated MoS2 Monolayer — •Chenjiang Qian1, Viviana Villafañe1, Pedro Soubelet1, Alexander Hötger1, Takashi Taniguchi2, Kenji Watanabe2, Nathan Wilson1, Andreas Stier1, Alexander Holleitner1, and Jonathan Finley1 — 1Walter Schottky Institut and Physik Department, Am Coulombwall 4, 85748 Garching, Germany — 2National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
Monolayer TMDs are ideal active materials for solid-state cQED. However, the direct cou-pling of TMDs to 0D nanocavities whilst preserving pristine excitonic properties and large cavi-ty-TMD overlap remains a challenge. Most commonly, non-encapsulated TMDs are stacked on top of prefabricated photonic structures using pick-and-place assembly. In this case, environ-mental disorders strongly perturb the excitonic properties. Whilst disorder can be mitigated by full hBN encapsulation, this approach moves the TMD away from the cavity field, thereby, trad-ing spatial coupling for homogeneous linewidth. Here, we integrate hBN/MoS2/hBN heterostruc-tures to Si3N4 nanobeams as hybrid nanocavities. Our approach solves the trade-off problem by making the unpatterned heterostructure a functional part of the cavity field. Therefore, the pris-tine excitonic quality, high cavity mode Q-factor > 10000, and the strong cavity-MoS2 overlap are achieved simultaneously. We study the coupling of MoS2 excitons to the cavity optical and vibrational modes using PL and Raman spectroscopy, and novel coupling phenomena are ob-served based.