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Strain fingerprinting of exciton valley character in 2D semiconductors.
Kumar, Abhijeet M; Yagodkin, Denis; Rosati, Roberto; Bock, Douglas J; Schattauer, Christoph; Tobisch, Sarah; Hagel, Joakim; Höfer, Bianca; Kirchhof, Jan N; Hernández López, Pablo; Burfeindt, Kenneth; Heeg, Sebastian; Gahl, Cornelius; Libisch, Florian; Malic, Ermin; Bolotin, Kirill I.
Afiliación
  • Kumar AM; Department of Physics, Freie Universität Berlin, Arnimallee 14, Berlin, Germany.
  • Yagodkin D; Department of Physics, Freie Universität Berlin, Arnimallee 14, Berlin, Germany.
  • Rosati R; Philipps-Universität Marburg, Mainzer Gasse 33, Marburg, Germany.
  • Bock DJ; Department of Physics, Freie Universität Berlin, Arnimallee 14, Berlin, Germany.
  • Schattauer C; Institute for Theoretical Physics, TU Wien, Wiedner Hauptstraße 8-10, Vienna, Austria.
  • Tobisch S; Institute for Theoretical Physics, TU Wien, Wiedner Hauptstraße 8-10, Vienna, Austria.
  • Hagel J; Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Gothenburg, Sweden.
  • Höfer B; Department of Physics, Freie Universität Berlin, Arnimallee 14, Berlin, Germany.
  • Kirchhof JN; Department of Physics, Freie Universität Berlin, Arnimallee 14, Berlin, Germany.
  • Hernández López P; Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Delft, The Netherlands.
  • Burfeindt K; Institute for Physics and IRIS Adlershof, Humboldt-Universität Berlin, Newtonstraße 15, Berlin, Germany.
  • Heeg S; Department of Physics, Freie Universität Berlin, Arnimallee 14, Berlin, Germany.
  • Gahl C; Institute for Physics and IRIS Adlershof, Humboldt-Universität Berlin, Newtonstraße 15, Berlin, Germany.
  • Libisch F; Department of Physics, Freie Universität Berlin, Arnimallee 14, Berlin, Germany.
  • Malic E; Institute for Theoretical Physics, TU Wien, Wiedner Hauptstraße 8-10, Vienna, Austria.
  • Bolotin KI; Philipps-Universität Marburg, Mainzer Gasse 33, Marburg, Germany.
Nat Commun ; 15(1): 7546, 2024 Aug 30.
Article en En | MEDLINE | ID: mdl-39214968
ABSTRACT
Intervalley excitons with electron and hole wavefunctions residing in different valleys determine the long-range transport and dynamics observed in many semiconductors. However, these excitons with vanishing oscillator strength do not directly couple to light and, hence, remain largely unstudied. Here, we develop a simple nanomechanical technique to control the energy hierarchy of valleys via their contrasting response to mechanical strain. We use our technique to discover previously inaccessible intervalley excitons associated with K, Γ, or Q valleys in prototypical 2D semiconductors WSe2 and WS2. We also demonstrate a new brightening mechanism, rendering an otherwise "dark" intervalley exciton visible via strain-controlled hybridization with an intravalley exciton. Moreover, we classify various localized excitons from their distinct strain response and achieve large tuning of their energy. Overall, our valley engineering approach establishes a new way to identify intervalley excitons and control their interactions in a diverse class of 2D systems.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2024 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2024 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido