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Philip Hofmann

Momentum-resolved linear dichroism in bilayer MoS2

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DOI

  • Klara Volckaert
  • Habib Rostami, Stockholm Univ, Stockholm University, Stockholm Resilience Ctr
  • ,
  • Deepnarayan Biswas
  • Igor Markovic, Max Planck Inst Chem Phys Solids, Max Planck Society
  • ,
  • Federico Andreatta
  • Charlotte E. Sanders, STFC Rutherford Appleton Lab, STFC Rutherford Appleton Laboratory, Science & Technology Facilities Council (STFC), Cent Laser Facil
  • ,
  • Paulina Majchrzak
  • Cephise Cacho, STFC Rutherford Appleton Lab, STFC Rutherford Appleton Laboratory, Science & Technology Facilities Council (STFC), Cent Laser Facil
  • ,
  • Richard T. Chapman, STFC Rutherford Appleton Lab, STFC Rutherford Appleton Laboratory, Science & Technology Facilities Council (STFC), Cent Laser Facil
  • ,
  • Adam Wyatt, STFC Rutherford Appleton Lab, STFC Rutherford Appleton Laboratory, Science & Technology Facilities Council (STFC), Cent Laser Facil
  • ,
  • Emma Springate, STFC Rutherford Appleton Lab, STFC Rutherford Appleton Laboratory, Science & Technology Facilities Council (STFC), Cent Laser Facil
  • ,
  • Daniel Lizzit, Elettra-Sincrotrone Trieste, Trieste,
  • Luca Bignardi, Univ Trieste, University of Trieste, Dept Phys
  • ,
  • Silvano Lizzit, Elettra-Sincrotrone Trieste, Trieste,
  • Sanjoy K. Mahatha
  • ,
  • Marco Bianchi
  • Nicola Lanata
  • Phil D. C. King, Univ StAndrews, University of St Andrews, Sch Phys & Astron, SUPA
  • ,
  • Jill A. Miwa
  • Alexander Balatsky, Stockholm Univ, Stockholm University, Stockholm Resilience Ctr
  • ,
  • Philip Hofmann
  • Søren Ulstrup

In solid state photoemission experiments it is possible to extract information about the symmetry and orbital character of the electronic wave functions via the photoemission selection rules that shape the measured intensity. This approach can be expanded in a pump-probe experiment where the intensity contains additional information about interband excitations induced by an ultrafast laser pulse with tunable polarization. Here, we find an unexpected strong linear dichroism effect (up to 42.4%) in the conduction band of bilayer MoS2, when measuring energy- and momentum-resolved snapshots of excited electrons by time- and angle-resolved photoemission spectroscopy. We model the polarization-dependent photoemission intensity in the transiently populated conduction band using the semiconductor Bloch equations. Our theoretical analysis reveals a strongly anisotropic momentum dependence of the optical excitations due to intralayer single-particle hopping, which explains the observed linear dichroism.

OriginalsprogEngelsk
Artikelnummer241406
TidsskriftPhysical Review B
Vol/bind100
Nummer24
Antal sider6
ISSN2469-9950
DOI
StatusUdgivet - 2019

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