Total Angular Momentum Dichroism of the Terahertz Vortex Beams at the Antiferromagnetic Resonances

A. A. Sirenko, P. Marsik, L. Bugnon, M. Soulier, C. Bernhard, T. N. Stanislavchuk, Xianghan Xu, S. W. Cheong

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Abstract

Terahertz vortex beams with different superposition of the orbital angular momentum l=±1, ±2, ±3, and ±4 and spin angular momentum σ=±1 were used to study antiferromagnetic (AFM) resonances in TbFe3(BO3)4 and Ni3TeO6 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 σ. The selection rules at the AFM resonances are governed by the total angular momentum of the vortex beam: J=σ+l. In particular, for l=±2, ±3, and ±4 the sign of l is shown to dominate over that for conventional circular polarization σ.

Original languageEnglish (US)
Article number157401
JournalPhysical Review Letters
Volume126
Issue number15
DOIs
StatePublished - Apr 12 2021

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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