Potential landscape engineering in two-dimensional transition metal dichalcogenides: towards hybrid optical-electrical quantum dots

ORAL

Abstract

Monolayer transition metal dichalcogenides (TMDCs) have attracted recent interest due to their unique excitonic and electronic properties. As gapped, semiconducting counterparts to graphene, they show particularly strong excitonic effects, which can be exploited both in pure monolayer devices, as well as in van der Waals heterostructures where the TMDC is encapsulated between layers of insulating hexagonal boron nitride (hBN). In this work, we discuss progress towards a unique platform that exploits the strong excitonic binding energies of the TMDCs to create a hybrid, electrically controlled yet optically active quantum dot device. Further, we report on recent experiments showing optically induced current from hole-doped molybdenum diselenide to graphite or metal electrodes across over 90nm of hBN, indicating a limitation of hBN encapsulation for hybrid optical-electronic devices in TMDCs along with a method for unipolar charge injection into uncontacted TMDC layers. Finally, we discuss methods for making tunable excitonic potential landscapes in TMDC heterostructures via modulation of the dielectric environment in reconfigurable moiré structures.

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Presenters

  • Andrey Sushko

    Physics, Harvard University, Harvard University

Authors

  • Andrey Sushko

    Physics, Harvard University, Harvard University

  • Kristiaan De Greve

    Harvard University, Physics, Harvard University

  • Luis Jauregui

    Physics, Harvard University, Harvard University

  • Ke Wang

    School of Physics and Astronomy, University of Minnesota

  • Kateryna Pistunova

    Physics, Harvard University, Harvard University

  • Andrew Y Joe

    Physics, Harvard University, Harvard University

  • Dominik S Wild

    Physics, Harvard University

  • Giovanni Scuri

    Physics, Harvard University, Harvard University

  • Alexander A High

    Institute for Molecular Engineering, University of Chicago

  • You Zhou

    Chemistry and Chemical Biology, Harvard University, Harvard University

  • Takashi Taniguchi

    National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 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, 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, NIMS, National Institute for Material Science, National Institute for Materials Science, Japan, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan, National Institute for Materials Science , 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, 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

  • 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

  • Philip Kim

    Harvard University, Department of Physics, Harvard University & School of Engineering and Applied Sciences, Harvard University, Department of Physics, Harvard University, Cambridge, MA 02138, USA., Physics, Harvard University, Physics and Applied Physics, Harvard University, Physics department, Harvard University

  • Hongkun Park

    Dept. of Chemistry and Chemical Biology and Dept. of Physics, Harvard University, Harvard University, Chemistry and Chemical Biology, Harvard University

  • Mikhail Lukin

    Harvard University, Physics, Harvard University