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

doi:10.1103/PhysRevLett.126.157401

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

Physics

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21 Scopus citations

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 language	English (US)
Article number	157401
Journal	Physical Review Letters
Volume	126
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.126.157401
State	Published - Apr 12 2021

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.126.157401

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title = "Total Angular Momentum Dichroism of the Terahertz Vortex Beams at the Antiferromagnetic Resonances",

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.",

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AU - Sirenko, A. A.

AU - Marsik, P.

AU - Bugnon, L.

AU - Soulier, M.

AU - Bernhard, C.

AU - Stanislavchuk, T. N.

AU - Xu, Xianghan

AU - Cheong, S. W.

PY - 2021/4/12

Y1 - 2021/4/12

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AB - 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.

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

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