TY - JOUR
T1 - Total Angular Momentum Dichroism of the Terahertz Vortex Beams at the Antiferromagnetic Resonances
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.
N1 - Funding Information:
The authors are grateful to K. Watt for the design of the spiral plates, to V. Kiryukhin for useful discussions, and to I. A. Gudim for the Tb FB crystal. Work at the New Jersey Institute of Technology and Rutgers was supported by the U.S. DOE under Contract No. DEFG02-07ER46382. The work at the University of Fribourg was funded by the Schweizerische Nationalfonds (SNF) by Grant No. 200020-172611. A. A. S. is grateful to SNF for the IZSEZ0-184564 support during his research visit at the University of Fribourg.
Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/4/12
Y1 - 2021/4/12
N2 - 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.
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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U2 - 10.1103/PhysRevLett.126.157401
DO - 10.1103/PhysRevLett.126.157401
M3 - Article
C2 - 33929250
AN - SCOPUS:85104841347
SN - 0031-9007
VL - 126
JO - Physical Review Letters
JF - Physical Review Letters
IS - 15
M1 - 157401
ER -