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Visualizing electron localization of WS2/WSe2 moiré superlattices in momentum space.
Stansbury, Conrad H; Utama, M Iqbal Bakti; Fatuzzo, Claudia G; Regan, Emma C; Wang, Danqing; Xiang, Ziyu; Ding, Mingchao; Watanabe, Kenji; Taniguchi, Takashi; Blei, Mark; Shen, Yuxia; Lorcy, Stéphane; Bostwick, Aaron; Jozwiak, Chris; Koch, Roland; Tongay, Sefaattin; Avila, José; Rotenberg, Eli; Wang, Feng; Lanzara, Alessandra.
Afiliación
  • Stansbury CH; Department of Physics, University of California Berkeley, Berkeley, CA 94720, USA.
  • Utama MIB; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
  • Fatuzzo CG; Department of Physics, University of California Berkeley, Berkeley, CA 94720, USA.
  • Regan EC; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
  • Wang D; Department of Materials Science and Engineering, University of California Berkeley, Berkeley, CA 94720, USA.
  • Xiang Z; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
  • Ding M; Department of Physics, University of California Berkeley, Berkeley, CA 94720, USA.
  • Watanabe K; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
  • Taniguchi T; Graduate Group in Applied Science and Technology, University of California Berkeley, Berkeley, CA 94720, USA.
  • Blei M; Department of Physics, University of California Berkeley, Berkeley, CA 94720, USA.
  • Shen Y; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
  • Lorcy S; Graduate Group in Applied Science and Technology, University of California Berkeley, Berkeley, CA 94720, USA.
  • Bostwick A; Department of Physics, University of California Berkeley, Berkeley, CA 94720, USA.
  • Jozwiak C; Department of Physics, University of California Berkeley, Berkeley, CA 94720, USA.
  • Koch R; Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
  • Tongay S; International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
  • Avila J; School of Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA.
  • Rotenberg E; School of Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA.
  • Wang F; Synchrotron-SOLEIL and Université Paris-Saclay Saint-Aubin, BP48, F91192 Gif sur Yvette Cedex, France.
  • Lanzara A; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Sci Adv ; 7(37): eabf4387, 2021 Sep 10.
Article en En | MEDLINE | ID: mdl-34516763
ABSTRACT
The search for materials with flat electronic bands continues due to their potential to drive strong correlation and symmetry breaking orders. Electronic moirés formed in van der Waals heterostructures have proved to be an ideal platform. However, there is no holistic experimental picture for how superlattices modify electronic structure. By combining spatially resolved angle-resolved photoemission spectroscopy with optical spectroscopy, we report the first direct evidence of how strongly correlated phases evolve from a weakly interacting regime in a transition metal dichalcogenide superlattice. By comparing short and long wave vector moirés, we find that the electronic structure evolves into a highly localized regime with increasingly flat bands and renormalized effective mass. The flattening is accompanied by the opening of a large gap in the spectral function and splitting of the exciton peaks. These results advance our understanding of emerging phases in moiré superlattices and point to the importance of interlayer physics.
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2021 Tipo del documento: Article País de afiliación: Estados Unidos
Texto completo
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2021 Tipo del documento: Article País de afiliación: Estados Unidos