Tunable transport dynamics of layer-hybridized excitons in a natural van Der Waals homobilayer

ORAL

Abstract

Dipolar interactions are fundamental for the thermalization and condensation of bosonic gases at finite times. Excitons with out-of-plane dipoles feature enhanced inter-particle interactions and longer lifetime, thanks to the dipole alignment and the electron-hole wavefunctions separation. In this work, we achieve control over the layer-hybridization of excitonic species in TMDC bilayers, thus changing the interplay between many-body interactions by means of a vertical electric field. Spatiotemporally-resolved studies allow us to characterize hybrid interlayer exciton (hIX) diffusion, revealing different trends of interactions according to the degree of hybridization. Finally, study the emission quantum yield with respect to excitation power and separate contributions of radiative and nonradiative decay mechanisms. Our work provides fundamental information for the implementation of efficient optoelectronic devices based on exciton transport and for the realization of condensation of bosonic gases.

*This work was financially supported by the European Research Council (grant no. 682332) the Swiss National Science Foundation (grants no. 164015, 177007, 175822, 205114), and the Marie Curie Sklodowska ITN network "2-Exciting" (grant no. 956813). This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 881603 (Graphene Flagship Core 3 Phase). Furthermore, the Malic's group acknowledges support from the Deutsche Forschungsgemeinschaft (DFG) vis SFB 1083.

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Publication: Tagarelli, F., Lopriore, E., Erkensten, D., Perea-Causin, R., Brem, S., Hagel, J., Sun, Z., Pasquale, G., Watanabe, K., Taniguchi, T., Malic, E., Kis, A. Electrical control of hybrid exciton transport in a van der Waals heterostructure

Presenters

  • Fedele Tagarelli

    • Ecole Polytechnique Federale de Lausanne

Authors

  • Fedele Tagarelli

    • Ecole Polytechnique Federale de Lausanne

  • Edoardo Lopriore

    • Ecole Polytechnique Federale de Lausanne

  • Daniel Erkensten

    • Chalmers University

  • Raul Perea-Causin

    • Chalmers University
    • Chalmers University of Technology

  • Samuel Brem

    • Philipps-Universität Marburg

  • Joakim Hagel

    • Chalmers University

  • ZHE SUN

    • Ecole Polytechnique Federale De Lausanne
    • EPFL

  • Gabriele Pasquale

    • EPFL

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Ermin Malic

    • Philipps-Universität Marburg

  • Andras Kis

    • Ecole Polytechnique Federale de Lausanne