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Title: Infrared Interlayer Exciton Emission in MoS 2 / WSe 2 Heterostructures

Abstract

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.

Authors:
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [6];  [3];  [7]; ORCiD logo [4];  [4]
  1. Stanford Univ., CA (United States). Dept. of Applied Physics
  2. Stanford Univ., CA (United States). Dept. of Electrical Engineering
  3. Friedrich-Alexander-Universität Erlangen-Nürnberg (Germany). Dept. Physik
  4. Stanford Univ., CA (United States). Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Columbia Univ., New York, NY (United States). Dept. of Mechanical Engineering
  6. National Inst. for Materials Science (NIMS), Tsukuba (Japan)
  7. Columbia Univ., New York, NY (United States). Dept. of Applied Physics and Applied Mathematics
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)
OSTI Identifier:
1583131
Grant/Contract Number:  
AC02-76-SF00515; GBMF4545; DMR-1708457; ECCS-1542152; JPMJCR15F3; PGSD3-502559-2017
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 24; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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., and Heinz, Tony F. Infrared Interlayer Exciton Emission in MoS2/WSe2 Heterostructures. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.247402.
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. Infrared Interlayer Exciton Emission in MoS2/WSe2 Heterostructures. United States. doi:https://doi.org/10.1103/PhysRevLett.123.247402
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., and Heinz, Tony F. Fri . "Infrared Interlayer Exciton Emission in MoS2/WSe2 Heterostructures". United States. doi:https://doi.org/10.1103/PhysRevLett.123.247402. https://www.osti.gov/servlets/purl/1583131.
@article{osti_1583131,
title = {Infrared Interlayer Exciton Emission in MoS2/WSe2 Heterostructures},
author = {Karni, Ouri and Barré, Elyse and Lau, Sze Cheung and Gillen, Roland and Ma, Eric Yue and Kim, Bumho and Watanabe, Kenji and Taniguchi, Takashi and Maultzsch, Janina and Barmak, Katayun and Page, Ralph H. and Heinz, Tony F.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.123.247402},
journal = {Physical Review Letters},
number = 24,
volume = 123,
place = {United States},
year = {2019},
month = {12}
}

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