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Terahertz vortex beam as a spectroscopic probe of magnetic excitations

  • Sirenko, Andrei A. Department of Physics, New Jersey Institute of Technology, Newark, New Jersey, USA
  • Maršík, Premysl Department of Physics, University of Fribourg, Switzerland
  • Bernhard, Christian Department of Physics, University of Fribourg, Switzerland
  • Stanislavchuk, T. N. Department of Physics, New Jersey Institute of Technology, Newark, New Jersey, USA
  • Kiryukhin, V. Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey, USA
  • Cheong, S.-W. Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey, USA
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    12.06.2019
Published in:
  • Physical Review Letters. - 2019, vol. 122, no. 23, p. 237401
English Circularly polarized light with spin angular momentum is one of the most valuable probes of magnetism. We demonstrate that light beams with orbital angular momentum (OAM), or vortex beams, can also couple to magnetism exhibiting dichroisms in a magnetized medium. Resonant optical absorption in a ferrimagnetic crystal depends strongly on both the handedness of the vortex and the direction of the beam propagation with respect to the sample magnetization. This effect exceeds the conventional dichroism for circularly polarized light. Our results demonstrate the high potential of the vortex beams with OAM as a new spectroscopic probe of magnetism in matter.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308053
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