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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 Finley11Walter 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.

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