Unconventional specular optical rotation in the charge ordered state of Kagome metal CsV 3 Sb 5 .

Autor: Farhang C; Department of Physics and Astronomy, University of California, Irvine, CA, 92697, USA., Wang J; Department of Physics and Astronomy, University of California, Irvine, CA, 92697, USA., Ortiz BR; Materials Department, University of California, Santa Barbara, Santa Barbara, CA, 93106, USA., Wilson SD; Materials Department, University of California, Santa Barbara, Santa Barbara, CA, 93106, USA., Xia J; Department of Physics and Astronomy, University of California, Irvine, CA, 92697, USA. xia.jing@uci.edu.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2023 Sep 01; Vol. 14 (1), pp. 5326. Date of Electronic Publication: 2023 Sep 01.
DOI: 10.1038/s41467-023-41080-5
Abstrakt: Kagome metals AV 3 Sb 5 (A = K, Cs, Rb) provide a rich platform for intertwined orders, where evidence for time-reversal symmetry breaking, likely due to the long-sought loop currents, has emerged in STM and muon spin relaxation experiments. An isotropic component in the spontaneous optical rotation has also been reported and was interpreted as the magneto-optic Kerr effect. Intriguingly, the observed rotations differ by five orders of magnitude between different wavelengths and samples, suggesting more intricate physics. Here we report optical rotation and polar Kerr measurements in CsV 3 Sb 5 crystals at the same wavelength. We observe large isotropic components of 1 milliradian in the optical rotation that do not respond to applied magnetic fields, while the spontaneous Kerr signal is less than 20 nanoradians. Our results prove unambiguously that the reported isotropic rotation is not from time-reversal symmetry breaking but represents the long-sought specular optical rotation and indicates a new intertwined order.
(© 2023. Springer Nature Limited.)
Databáze: MEDLINE
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