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Intrinsic circularly polarized exciton emission in a twisted van der Waals heterostructure

J. Michl1, C. C. Palekar2, S. A. Tarasenko3, F. Lohof4,5, C. Gies4,5, M. von Helversen2, R. Sailus6, S. Tongay6, T. Taniguchi7 et al.

K. Watanabe8, T. Heindel2, B. Rosa2, M. Rödel9, T. Shubina3, S. Höfling1, S. Reitzenstein2, C. Anton-Solanas1,10, and C. Schneider10

  • 1Technische Physik, Physikalische Institut and Wilhelm Conrad Röntgen-Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
  • 2Institute of Solid State Physics, Technische Universität Berlin, D-10623 Berlin, Germany
  • 3Ioffe Institute, 194021 St. Petersburg, Russia
  • 4Institute for Theoretical Physics, University of Bremen, D-28334 Bremen, Germany
  • 5Bremen Center for Computational Materials Science, University of Bremen, 28359 Bremen, Germany
  • 6School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, Arizona 85287, USA
  • 7International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • 8Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
  • 9Experimentelle Physik 6, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
  • 10Institute of Physics, Carl von Ossietzky University, 26129 Oldenburg, Germany

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Phys. Rev. B 105, L241406 – Published 13 June, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L241406

Abstract

We report the emergence of a significant degree of intrinsic circular polarization of exciton photoluminescence in a twisted MoSe2/WSe2 heterostructure upon nonresonant driving with a linearly polarized laser. The effect is not related to the polarization of the incident light. Moreover, it is present at zero magnetic field, and reacts perceptibly to a perpendicularly applied magnetic field that, unexpectedly, can strongly diminish this effect. The giant magnitude of the polarization, which cannot be explained by natural optical activity or circular dichroism of the twisted lattice, suggests a kinematic origin arising from an emergent pyromagnetic symmetry in our structure, which we exploit to gain insight into the microscopic optical processes of our device.

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Phys. Rev. B 105, L241406– Published 13 June, 2022
  • Received 20 May 2021
  • Revised 25 March 2022
  • Accepted 18 May 2022
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