Extremely Efficient Light-Exciton Interaction in a Monolayer WS2 van der Waals Heterostructure Cavity

Itai Epstein; Bernat Terrés; André J. Chaves; Varun-Varma Pusapati; Daniel A. Rhodes; Bettina Frank; Valentin Zimmermann; Ying Qin; Kenji Watanabe; Takashi Taniguchi; Harald Giessen; Sefaattin Tongay; James C. Hone; Nuno M. R. Peres; Nuno M. R. Peres; Frank H. L. Koppens; Frank H. L. Koppens

doi:10.1364/CLEO_QELS.2020.FF3B.2

Conference on Lasers and Electro-Optics
OSA Technical Digest (Optica Publishing Group, 2020),
paper FF3B.2
•https://doi.org/10.1364/CLEO_QELS.2020.FF3B.2

Extremely Efficient Light-Exciton Interaction in a Monolayer WS2 van der Waals Heterostructure Cavity

Itai Epstein, Bernat Terrés, André J. Chaves, Varun-Varma Pusapati, Daniel A. Rhodes, Bettina Frank, Valentin Zimmermann, Ying Qin, Kenji Watanabe, Takashi Taniguchi, Harald Giessen, Sefaattin Tongay, James C. Hone, Nuno M. R. Peres, and Frank H. L. Koppens

CLEO: QELS_Fundamental Science 2020

Washington, DC United States
10–15 May 2020
ISBN: 978-1-943580-76-7

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Ultrafast Phenomena in Two-Dimensional Semiconductors and Heterostructures (FF3B)

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I. Epstein, B. Terrés, A. J. Chaves, V. Pusapati, D. A. Rhodes, B. Frank, V. Zimmermann, Y. Qin, K. Watanabe, T. Taniguchi, H. Giessen, S. Tongay, J. C. Hone, N. M. R. Peres, and F. H. L. Koppens, "Extremely Efficient Light-Exciton Interaction in a Monolayer WS2 van der Waals Heterostructure Cavity," in Conference on Lasers and Electro-Optics, OSA Technical Digest (Optica Publishing Group, 2020), paper FF3B.2.

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Abstract

Excitons in monolayer transition-metal-dichalcogenides dominate their optical response, however, the achieved light-exciton interaction strength have been far below unity, and a complete picture of its underlying physics and fundamental limits has not been provided. Using a van der Waals heterostructure cavity, we demonstrate near-unity excitonic absorption, together with efficient emission at ultra-low excitation powers. We find that the interplay between the radiative, non-radiative and dephasing decay rates plays a crucial role in this interaction, and unveil a universal absorption law for excitons in 2D systems.

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