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, Frank H.L. Koppens

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish (US)
Title of host publicationCLEO
Subtitle of host publicationQELS_Fundamental Science, CLEO_QELS 2020
PublisherOptica Publishing Group (formerly OSA)
ISBN (Print)9781943580767
StatePublished - 2020
EventCLEO: QELS_Fundamental Science, CLEO_QELS 2020 - Washington, United States
Duration: May 10 2020May 15 2020

Publication series

NameOptics InfoBase Conference Papers
VolumePart F182-CLEO-QELS 2020
ISSN (Electronic)2162-2701


ConferenceCLEO: QELS_Fundamental Science, CLEO_QELS 2020
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials


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