@article{b1611b93c80744df861a04549b95ffe7,
title = "Near-unity light absorption in a monolayer ws2 van der waals heterostructure cavity",
abstract = "Excitons in monolayer transition-metal-dichalcogenides (TMDs) dominate their optical response and exhibit strong light-matter interactions with lifetime-limited emission. While various approaches have been applied to enhance light-exciton interactions in TMDs, the achieved strength have been far below unity, and a complete picture of its underlying physical mechanisms and fundamental limits has not been provided. Here, we introduce a TMD-based van der Waals heterostructure cavity that provides near-unity excitonic absorption, and emission of excitonic complexes that are observed at ultralow excitation powers. Our results are in full agreement with a quantum theoretical framework introduced to describe the light-exciton-cavity interaction. We find that the subtle interplay between the radiative, nonradiative and dephasing decay rates plays a crucial role, and unveil a universal absorption law for excitons in 2D systems. This enhanced light-exciton interaction provides a platform for studying excitonic phase-transitions and quantum nonlinearities and enables new possibilities for 2D semiconductor-based optoelectronic devices.",
keywords = "2D materials, Exciton complexes, Light-matter interaction, TMD Excitons, Unity absorption",
author = "Itai Epstein and Bernat Terr{\'e}s and Chaves, {Andr{\'e} J.} and Pusapati, {Varun Varma} and Rhodes, {Daniel A.} and Bettina Frank and Valentin Zimmermann and Ying Qin and Kenji Watanabe and Takashi Taniguchi and Harald Giessen and Sefaattin Tongay and Hone, {James C.} and Peres, {Nuno M.R.} and Koppens, {Frank H.L.}",
note = "Funding Information: The authors thank Mr. David Alcaraz Iranzo, Dr. Fabien Vialla, and Dr. Antoine Reserbat-Plantey for fruitful discussions. F.H.L.K. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness through the “Severo Ochoa” Programme for Centres of Excellence in R and D (SEV-2015-0522), support by Fundacio Cellex Barcelona, Generalitat de Catalunya through the CERCA program, and the Mineco grants Ramon y Cajal (RYC-2012-12281, Plan Nacional (FIS2013-47161-P and FIS2014-59639-JIN), and the Agency for Management of University and Research Grants (AGAUR) 2017 SGR 1656. Furthermore, the research leading to these results has received funding from the European Union Seventh Framework Programme under grant agreement numbers 785219 and 881603 Graphene Flagship. This work was supported by the ERC TOPONANOP under grant agreement number 726001 and the MINECO Plan Nacional Grant 2D-NANOTOP under reference number FIS2016-81044-P. S.T. acknowledges support from NSF DMR-1552220 and DMR-1838443. N.M.R.P acknowledges financing from European Commission through the project “Graphene-Driven Revolutions in ICT and Beyond” (ref. no. 785219) and from FEDER and the Portuguese Foundation for Science and Technology (FCT) through project POCI-01-0145-FEDER-028114. H.G. and B.F. acknowledge support from ERC advanced grant COMPLEXPLAS. J.H. and D.R. acknowledge the funding support by the NSF MRSEC program through Columbia in the Center for Precision Assembly of Superstratic and Superatomic Solids (DMR-1420634). Publisher Copyright: {\textcopyright} 2020 American Chemical Society.",
year = "2020",
month = may,
day = "13",
doi = "10.1021/acs.nanolett.0c00492",
language = "English (US)",
volume = "20",
pages = "3545--3552",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "5",
}