Total Angular Momentum Dichroism of the Terahertz Vortex Beams at the Antiferromagnetic Resonances
- Sirenko, Andrei A. Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102, USA / Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- Marsik, Premysl Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- Bugnon, Laurent Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- Soulier, Mathias Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- Bernhard, Christian Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland
- Stanislavchuk, T. N. Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102, USA
- Xu, Xianghan Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
- Cheong, S.-W. Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
- 12.04.2021
Published in:
- Physical Review Letters. - 2021, vol. 126, no. 15, p. 157401
Optical absorption spectroscopy
Optically detected magnetic resonance
Terahertz spectroscopy
Antiferromagnets
Magnetic coupling
Magnetic interactions
Magnetic order
Magneto-optical spectra
English
Terahertz vortex beams with different superposition of the orbital angular momentum $l={\pm}1$, ${\pm}2$, ${\pm}3$, and ${\pm}4$ and spin angular momentum ${\sigma}={\pm}1$ were used to study antiferromagnetic (AFM) resonances in TbFe$_3$(BO$_3$)$_4$ and Ni$_3$TeO$_6$ single crystals. In both materials we observed a strong vortex beam dichroism for the AFM resonances that are split in external magnetic field. The magnitude of the vortex dichroism is comparable to that for conventional circular dichroism due to ${\sigma}$. The selection rules at the AFM resonances are governed by the total angular momentum of the vortex beam: $j= {\sigma}+l$. In particular, for $l={\pm}2$, ${\pm}3$, and ${\pm}4$ the sign of $l$ is shown to dominate over that for conventional circular polarization ${\sigma}$.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
-
- English
- Classification
- Physics
- License
- License undefined
- Identifiers
-
- RERO DOC 330338
- DOI 10.1103/PhysRevLett.126.157401
- Persistent URL
- https://folia.unifr.ch/unifr/documents/309184
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