Infrared Interlayer Exciton Emission in MoS2/WSe2 Heterostructures

Karni, Ouri; Barré, Elyse; Lau, Sze Cheung; Gillen, Roland; Ma, Eric Yue; Kim, Bumho; Watanabe, Kenji; Taniguchi, Takashi; Maultzsch, Janina; Barmak, Katayun; Page, Ralph H.; Heinz, Tony F.

doi:10.1103/PhysRevLett.123.247402

Title: Infrared Interlayer Exciton Emission in ${MoS}_{2} / {WSe}_{2}$ Heterostructures

Journal Article · 12 December 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.123.247402 · OSTI ID:1583131

Karni, Ouri ^[1]; Barré, Elyse ^[2]; Lau, Sze Cheung ^[1]; Gillen, Roland ^[3]; Ma, Eric Yue ^[4]; Kim, Bumho ^[5]; Watanabe, Kenji ^[6]; Taniguchi, Takashi ^[6]; Maultzsch, Janina ^[3]; Barmak, Katayun ^[7];

^[4]; Heinz, Tony F. ^[4]

Stanford Univ., CA (United States). Dept. of Applied Physics
Stanford Univ., CA (United States). Dept. of Electrical Engineering
Friedrich-Alexander-Universität Erlangen-Nürnberg (Germany). Dept. Physik
Stanford Univ., CA (United States). Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
Columbia Univ., New York, NY (United States). Dept. of Mechanical Engineering
National Inst. for Materials Science (NIMS), Tsukuba (Japan)
Columbia Univ., New York, NY (United States). Dept. of Applied Physics and Applied Mathematics

Here, we report light emission around 1 eV (1240 nm) from heterostructures of MoS₂ and WSe₂ transition metal dichalcogenide monolayers. We identify its origin in an interlayer exciton (ILX) by its wide spectral tunability under an out-of-plane electric field. From the static dipole moment of the state, its temperature and twist-angle dependence, and comparison with electronic structure calculations, we assign this ILX to the fundamental interlayer transition between the K valleys in this system. Our results gain access to the interlayer physics of the intrinsically incommensurate MoS₂/WSe₂ heterostructure, including moiré and valley pseudospin effects, and its integration with silicon photonics and optical fiber communication systems operating at wavelengths longer than 1150 nm.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1583131

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 123; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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