Tailoring the electroluminescence of dual-gated monolayer p–n diodes

ORAL

Abstract

Owing to their direct bandgaps and atomic-scale thickness, monolayer transition metal dichalcogenides have been heavily investigated for optoelectronic applications. Their potential for atomically-thin visible frequency light sources can be realized by lateral monolayer p–n diodes defined by local electrostatic gates. Control over the spectral distribution and polarization of the electroluminescence is desirable for integrating these prototypical monolayer LEDs into optoelectronic and nanophotonic devices with tunable coupling. The high electric fields near the p–n interface in these single-monolayer devices provide a route for in situ control of emission. Here, we discuss electrical tuning of the electroluminescence from the electrostatically-induced interface of gate-defined monolayer WSe2 p–n diodes. We observe strong linear polarization (∼ 50%) of the electrically-pumped luminescence and a gate-tunable emission energy shift originating at this interface. Current-induced valley polarization, a possible avenue to achieving electrically-controlled circularly polarized emission, is also investigated with spatially-resolved Kerr rotation at cryogenic temperatures

*Work supported by the Office of Naval Research (N00014-16-1-3055).

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Presenters

  • Erik Lenferink

    • Physics and Astronomy, Northwestern University

Authors

  • Erik Lenferink

    • Physics and Astronomy, Northwestern University

  • Kenji Watanabe

    • National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305 0044, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science, , 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044
    • National Institute of Materials Science
    • NIMS, Japan
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Tsukuba, Japan
    • National Institute for Materials Science, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0044, Japan
    • National Institute for Materials Science (NIMS)
    • NIMS Tsukuba
    • National Institute for Materials Science (Japan)
    • NIMS
    • National Institute for Material Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan
    • National Institute for Materials Science , Japan
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
    • Advanced Materials Laboratory, National Institute for Materials Science, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • National Institute for Materials Science, Tsukuba, Ibaraki 305- 0044, Japan
    • National Institute for Material Science - Japan
    • National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan
    • National Institute of Material Science
    • Advanced Material Lab, NIMS
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • National Institute for Materials Science, Tsukuba
    • 1-1 Namiki, Tsukuba, National Institute for Materials Science
    • NIMS/Tsukuba
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044 Japan
    • National Institute for Materials Science, Namiki, 305-0044, Japan
    • National Institute for Material Science, Japan
    • Advanced Materials Laboratory, NIMS, Japan
    • Columbia University
    • Advanced Materials Labaratory, National Institute for Materials Science
    • National Institute of Material Science, 1-1 Namiki, Tsukuba, Ibaraki 205-0044, Japan
    • National Institute of Materials Science, Japan

  • Takashi Taniguchi

    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science, Japan
    • National Institute for Materials Science (Japan)
    • National Institute for Materials Science
    • NIMS
    • Kyoto University
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
    • National Institute of Materials Science

  • Nathaniel Stern

    • Northwestern University
    • Physics and Astronomy, Northwestern University
    • Physics and Astronomy, Northwestern University, Evanston, IL, United States