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

Authors

A. A. Sirenko, New Jersey Institute of Technology
P. Marsik, University of Fribourg
L. Bugnon, University of Fribourg
M. Soulier, University of Fribourg
C. Bernhard, University of Fribourg
T. N. Stanislavchuk, New Jersey Institute of Technology
Xianghan Xu, Department of Physics and Astronomy
S. W. Cheong, Department of Physics and Astronomy

Document Type

Article

Publication Date

4-12-2021

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.

Identifier

85104841347 (Scopus)

Publication Title

Physical Review Letters

External Full Text Location

https://doi.org/10.1103/PhysRevLett.126.157401

e-ISSN

10797114

ISSN

00319007

PubMed ID

33929250

Issue

15

Volume

126

Grant

DEFG02-07ER46382

Fund Ref

U.S. Department of Energy

Recommended Citation

Sirenko, A. A.; Marsik, P.; Bugnon, L.; Soulier, M.; Bernhard, C.; Stanislavchuk, T. N.; Xu, Xianghan; and Cheong, S. W., "Total Angular Momentum Dichroism of the Terahertz Vortex Beams at the Antiferromagnetic Resonances" (2021). Faculty Publications. 4179.
https://digitalcommons.njit.edu/fac_pubs/4179