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  • Letter
  • Open Access

All-optical generation of antiferromagnetic magnon currents via the magnon circular photogalvanic effect

Emil Viñas Boström1,*, Tahereh Sadat Parvini2,3, James W. McIver1, Angel Rubio1,4, Silvia Viola Kusminskiy2,5, and Michael A. Sentef1,†

  • 1Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science (CFEL), Luruper Chaussee 149, 22761 Hamburg, Germany
  • 2Max Planck Institute for the Science of Light, Staudtstrasse 2, PLZ 91058 Erlangen, Germany
  • 3Institute of Physics, University of Greifswald, Felix-Hausdorff-Str. 6, 17489 Greifswald, Germany
  • 4Center for Computational Quantum Physics, The Flatiron Institute, 162 Fifth Avenue, New York, New York 10010, USA
  • 5Institute for Theoretical Physics, University of Erlangen-Nürnberg, Staudtstrasse 7, 91058 Erlangen, Germany

  • *emil.bostrom@mpsd.mpg.de
  • †michael.sentef@mpsd.mpg.de

Phys. Rev. B 104, L100404 – Published 7 September, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L100404

Abstract

We introduce the magnon circular photogalvanic effect enabled by two-magnon Raman scattering. This provides an all-optical pathway to the generation of directed magnon currents with circularly polarized light in honeycomb antiferromagnetic insulators. The effect is the leading order contribution to magnon photocurrent generation via optical fields. Control of the magnon current by the polarization and angle of incidence of the laser is demonstrated. Experimental detection by sizable inverse spin Hall voltages in platinum contacts is proposed.

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