Giant Stark splitting of an exciton in bilayer MoS<sub>2</sub>

ORAL

Abstract

Transition metal dichalcogenides constitute a versatile platform for atomically thin opto-electronic devices.
We integrate homobilayer MoS2 in a dual-gate device structure allowing independent control of the electron density and out-of-plane electric field [1]. On increasing the electric field at close-to-zero electron concentration, we observe two well-separated features in our absorption measurements: the energy degeneracy of the two interlayer exciton configurations is lifted. This result reveals a large in-built electric dipole. It is consistent with an interlayer character of the transition: the electron is localized in the top or the bottom layer, while the hole is delocalized across the bilayer. We tune the energy splitting between these two interlayer excitons by as much as 120 meV such that we are able to bring the interlayer excitons energetically close to resonance with the intralayer states. While the interaction with the intralayer A-exciton is weak, we observe an avoided crossing of the upper interlayer exciton with the intralayer B-exciton.
These highly tunable excitonic transitions with large oscillator strength hold great promise for non-linear optics with polaritons.

[1] N. Leisgang et al., Nature Nanotechnology (2020).

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Presenters

  • Nadine Leisgang

    • Department of Physics, University of Basel, Basel, Switzerland
    • Department of Physics, University of Basel
    • University of Basel

Authors

  • Nadine Leisgang

    • Department of Physics, University of Basel, Basel, Switzerland
    • Department of Physics, University of Basel
    • University of Basel

  • Shivangi Shree

    • CNRS/INSA

  • Ioannis Paradisanos

    • Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077, Toulouse, France
    • INSA-CNRS-UPS, LPCNO, Université de Toulouse
    • CNRS/INSA
    • LPCNO, Université de Toulouse, INSA-CNRS-UPS, 135 Avenue Rangueil, 31077 Toulouse, France

  • Lukas Sponfeldner

    • Department of Physics, University of Basel
    • University of Basel

  • Cedric ROBERT

    • Institut National des Sciences Appliquees de Toulouse
    • Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077, Toulouse, France
    • CNRS/INSA
    • LPCNO, Université de Toulouse, INSA-CNRS-UPS, 135 Avenue Rangueil, 31077 Toulouse, France

  • Delphine Lagarde

    • Institut National des Sciences Appliquees de Toulouse
    • CNRS/INSA

  • Andrea Balocchi

    • Institut national de sciences appliquees toulouse
    • CNRS/INSA

  • Kenji Watanabe

    • National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institure for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • NIMS
    • National Institute of Materials Science
    • National Institute for Materials Science (NIMS)
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science,1-1 Namiki
    • National Institute of Material Science
    • National Institute for Materials Science, Tsukuba, Japan
    • Research Center for Functional Materials, NIMS
    • National Institute of Materials Science, Tsukuba, Japan
    • National Institude for Materials Science
    • National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials
    • NIMS - Japan
    • National Institute for Materials Science ,Japan
    • National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan
    • National Institute for Material Science
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science Japan
    • NIMS Tsukuba
    • National Institute for Materials Science, Research Center for Functional Materials, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP
    • National Institue for Material Science
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • Materials, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In
    • Research Center for Functional Materials, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials nanoarchtectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • NIMS Suguba
    • NIMS, Tsukuba, Japan
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan
    • National institute of material science
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • Advanced Materials Laboratory, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science, Ibaraki, Japan
    • National Institute for Materials Science, Research Center for Functional Materials
    • National Institute of Material Science, Japan
    • Tsukuba, National Institute for Materials Science

  • Takashi Taniguchi

    • National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institure for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • NIMS
    • National Institute of Materials Science
    • National Institute for Materials Science (NIMS)
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science,1-1 Namiki
    • National Institute of Material Science
    • National Institute for Materials Science, Tsukuba, Japan
    • International Center for Materials Nanoarchitectonics, NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute of Materials Science, Tsukuba, Japan
    • National Institude for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials
    • NIMS - Japan
    • National Institute for Materials Science ,Japan
    • National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan
    • National Institute for Material Science
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science Japan
    • 8International Center for Materials Nanoarchitectonics
    • NIMS Tsukuba
    • National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP
    • National Institue for Material Science
    • National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In
    • Research Center for Functional Materials, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • International Center for Material Nanoarchitectonics, National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics
    • NIMS Suguba
    • NIMS, Tsukuba, Japan
    • National Cheng Kung University
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan
    • National institute of material science
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, International Center for Materials Nanoarchitectonics
    • National Institute of Material Science, Japan
    • Tsukuba, National Institute for Materials Science

  • Xavier Marie

    • Institut National des Sciences Appliquees de Toulouse
    • Institut national de sciences appliquees toulouse
    • Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077, Toulouse, France
    • INSA-CNRS-UPS, LPCNO, Université de Toulouse
    • CNRS/INSA
    • LPCNO, Université de Toulouse, INSA-CNRS-UPS, 135 Avenue Rangueil, 31077 Toulouse, France

  • Richard J. Warburton

    • University of Basel
    • Department of Physics, University of Basel, Basel, Switzerland
    • Department of Physics, University of Basel
    • Physics, University of Basel

  • Iann C Gerber

    • Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077, Toulouse, France
    • INSA-CNRS-UPS, LPCNO, Université de Toulouse
    • CNRS/INSA

  • Bernhard Urbaszek

    • Institut National des Sciences Appliquees de Toulouse
    • Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077, Toulouse, France
    • INSA-CNRS-UPS, LPCNO, Université de Toulouse
    • CNRS/INSA
    • LPCNO, Université de Toulouse, INSA-CNRS-UPS, 135 Avenue Rangueil, 31077 Toulouse, France