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Ultrafast Hidden Spin Polarization Dynamics of Bright and Dark Excitons in 2 H − WSe 2

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  • معلومة اضافية
    • Contributors:
      Laboratoire de Physique des Matériaux et des Surfaces (LPMS); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CY Cergy Paris Université (CY); Physikalisches Institut Würzburg; Julius-Maximilians-Universität Würzburg = University of Würzburg Würsburg, Germany (JMU); Attophysique (ATTO); Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDYL); Institut Rayonnement Matière de Saclay (DRF) (IRAMIS); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Université Paris-Saclay-CY Cergy Paris Université (CY)-Institut Rayonnement Matière de Saclay (DRF) (IRAMIS); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Université Paris-Saclay-CY Cergy Paris Université (CY); Centre d'Etudes Lasers Intenses et Applications (CELIA); Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS); Beijing National Laboratory for Condensed Matter Physics; Chinese Academy of Sciences Changchun Branch (CAS); University of West Bohemia Plzeň; ANR-11-EQPX-0034,PATRIMEX,PATrimoines matériels : Réseau d'Instrumentation Multisites Expérimental(2011)
    • بيانات النشر:
      HAL CCSD
      American Physical Society
    • الموضوع:
      2023
    • Collection:
      Université Paris Seine: ComUE (HAL)
    • نبذة مختصرة :
      International audience ; We performed spin-, time-and angle-resolved extreme ultraviolet photoemission spectroscopy of excitons prepared by photoexcitation of inversion-symmetric 2H-WSe 2 with circularly polarized light. The very short probing depth of XUV photoemission permits selective measurement of photoelectrons originating from the topmost WSe 2 layer, allowing for direct measurement of hidden spin polarization of bright and momentum-forbidden dark excitons. Our results reveal efficient chiroptical control of bright excitons' hidden spin polarization. Following optical photoexcitation, intervalley scattering between nonequivalent K-K 0 valleys leads to a decay of bright excitons' hidden spin polarization. Conversely, the ultrafast formation of momentum-forbidden dark excitons acts as a local spin polarization reservoir, which could be used for spin injection in van der Waals heterostructures involving multilayer transition metal dichalcogenides.
    • الرقم المعرف:
      10.1103/PhysRevLett.131.066402
    • الدخول الالكتروني :
      https://hal.science/hal-04239132
      https://hal.science/hal-04239132v1/document
      https://hal.science/hal-04239132v1/file/PhysRevLett.131.066402.pdf
      https://doi.org/10.1103/PhysRevLett.131.066402
    • Rights:
      info:eu-repo/semantics/OpenAccess
    • الرقم المعرف:
      edsbas.B515A4A7