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BEGIN:VEVENT
DTSTART;VALUE=DATE:20191216T130000
DTEND;VALUE=DATE:20191216T130000
UID:7097@agenda.unifr.ch
DESCRIPTION:Terahertz (THz) vortex beams with various combinations of the orbital angular\nmomenta l=±1, ±2, ±3, and ±4 and the spin angular momentum s = ±1, or\nconventional circular polarization, were used for studies of the magnon spectra\nat the antiferromagnetic (AFM) resonance conditions in TbFe3(BO3)4 . We\nobserved strong vortex beam dichroism for the magnon doublet which is split in\nthe external magnetic field of ±0.5T. The absorption conditions at the magnon\nenergy depend on the total angular momentum of the light j that is determined\nby the combination of the spin and orbital angular momenta: j=s+l. For the\nhigher orders of l, the selection rules for AFM resonances dictated by l\ncompletely dominate over the ones for conventional circular polarization.
SUMMARY:Competition between spin and orbital dichroism of the terahertz vortex beams at the antiferromagnetic resonance in TbFe3(BO3)4
CATEGORIES:Séminaire
LOCATION:PER 08\, 0.58.5\, Chemin du Musée 3\, 1700 Fribourg
URL;VALUE=URI:https://agenda.unifr.ch/e/fr/7097
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