Nonreciprocity of Optical Absorption in the Magnetoelectric Antiferromagnet CuB[sub.2]O[sub.4]

The change in the absorption spectra due to reversal of the direction of light propagation (nonreciprocity of absorption) is a consequence of a simultaneous violation of both time-reversal and spatial-inversion symmetries. Here, we report on a high-resolution spectroscopic study of absorption nonrec...

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Bibliographic Details
Published in:Magnetochemistry 2023-03, Vol.9 (4)
Main Authors: Boldyrev, Kirill N, Molchanova, Anastasiia D, Nurmukhametov, Alexey R, Eremin, Mikhail V, Pisarev, Roman V, Popova, Marina N
Format: Article
Language:English
Subjects:
Absorption spectra
Analysis
Borates
Copper compounds
Identification and classification
Magnetic fields
Magnetic properties
Optical properties
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Summary:The change in the absorption spectra due to reversal of the direction of light propagation (nonreciprocity of absorption) is a consequence of a simultaneous violation of both time-reversal and spatial-inversion symmetries. Here, we report on a high-resolution spectroscopic study of absorption nonreciprocity in the noncentrosymmetric multiferroic CuB[sub.2] O[sub.4] below the antiferromagnetic transition temperature T[sub.N] = 21 K in the commensurate phase in magnetic fields up to 0.5 T. The study was performed in a broad spectral region covering several exciton transitions, which all are followed by an anomalously rich structure due to the multiple exciton-magnon-phonon satellites. Two components were resolved for the spectral line near 1.4 eV corresponding to the exciton transition between the ground and the first excited state. A quantitative theory of the optical absorption and nonreciprocity at this line was developed. The theory takes into account the interference between the electric and magnetic dipole contributions to the absorption and gives an adequate explanation of the relevant effects.
ISSN:2312-7481
2312-7481
DOI:10.3390/magnetochemistry9040095