Narrow excitonic lines and large-scale homogeneity of transition metal dichalcogenides grown by MBE on hBN

ORAL

Abstract

Monolayer transition metal dichalcogenides (TMDs) exhibit exceptional optical properties such as high oscillator strength and narrow excitonic resonances. However, above effects have been so far explored only for structures produced by techniques involving mechanical exfoliation and encapsulation in hBN inevitably inducing considerable large-scale inhomogeneity. On the other hand, techniques which are essentially free from this disadvantage, such as molecular beam epitaxy (MBE), have to date yielded only structures characterized by considerable spectral broadening, which hinders most of interesting optical effects.
We report [1] for the first time on the MBE-grown TMD exhibiting narrow and fully resolved spectral lines of neutral and charged exciton. Moreover, our MBE-grown TMD exhibits unprecedented high spatial homogeneity of optical properties, with variation of the exciton energy as small as 0.16 meV over a distance of tens of micrometers. Our recipe for MBE growth is presented for MoSe2 and includes extremely slow growth rate and the use of atomically flat hexagonal boron nitride (hBN) substrate. Importantly, good optical properties are achieved for as-grown sample, without any post growth mechanical treatment.
[1] W. Pacuski et al., Nano Letters 20, 3058 (2020).

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Presenters

  • Wojciech Pacuski

    • University of Warsaw

Authors

  • Wojciech Pacuski

    • University of Warsaw

  • Magdalena Grzeszczyk

    • University of Warsaw

  • Karol Nogajewski

    • University of Warsaw

  • Aleksander Bogucki

    • University of Warsaw

  • Kacper Oreszczuk

    • University of Warsaw

  • Aleksander Rodek

    • University of Warsaw

  • Julia Kucharek

    • University of Warsaw

  • Karolina Polczynska

    • University of Warsaw

  • Bartlomiej Seredynski

    • University of Warsaw

  • Rafal Bozek

    • University of Warsaw

  • Slawomir Kret

    • Institute of Physics, Polish Academy of Sciences

  • Takashi Taniguchi

    • National Institute for Materials Science, Japan
    • National Institute for Materials Science
    • Department of Chemical Engineering, Kyoto University
    • National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • Materials, NIMS
    • International Center for Materials Anorthite, National Institute for Materials Science, Ibaraki, Japan
    • Kyoto University

  • 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

  • Janusz Sadowski

    • University of Warsaw

  • Tomasz Kazimierczuk

    • Faculty of Physics, University of Warsaw
    • University of Warsaw

  • Marek Potemski

    • Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA
    • Laboratoire National des Champs Magnétiques Intenses

  • Piotr Kossacki

    • University of Warsaw