133301 20260217205514.0 doi 10.1038/s41467-024-45266-3 sideral 137950 ART-2024-137950 eng Ermolaev, Georgy A. Wandering principal optical axes in van der Waals triclinic materials 2024 Access copy available to the general public Unrestricted Nature is abundant in material platforms with anisotropic permittivities arising from symmetry reduction that feature a variety of extraordinary optical effects. Principal optical axes are essential characteristics for these effects that define light-matter interaction. Their orientation – an orthogonal Cartesian basis that diagonalizes the permittivity tensor, is often assumed stationary. Here, we show that the low-symmetry triclinic crystalline structure of van der Waals rhenium disulfide and rhenium diselenide is characterized by wandering principal optical axes in the space-wavelength domain with above π/2 degree of rotation for in-plane components. In turn, this leads to wavelength-switchable propagation directions of their waveguide modes. The physical origin of wandering principal optical axes is explained using a multi-exciton phenomenological model and ab initio calculations. We envision that the wandering principal optical axes of the investigated low-symmetry triclinic van der Waals crystals offer a platform for unexplored anisotropic phenomena and nanophotonic applications. info:eu-repo/grantAgreement/ES/DGA/Q-MAD info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 15.7 2024 MULTIDISCIPLINARY SCIENCES 10 / 136 = 0.074 2024 Q1 T1 4.761 2024 Biochemistry, Genetics and Molecular Biology (miscellaneous) 2024 Q1 Physics and Astronomy (miscellaneous) 2024 Q1 Chemistry (miscellaneous) 2024 Q1 23.4 2024 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Voronin, Kirill V. Toksumakov, Adilet N. Grudinin, Dmitriy V. Fradkin, Ilia M. Mazitov, Arslan Slavich, Aleksandr S. Tatmyshevskiy, Mikhail K. Yakubovsky, Dmitry I. Solovey, Valentin R. Kirtaev, Roman V. Novikov, Sergey M. Zhukova, Elena S. Kruglov, Ivan Vyshnevyy, Andrey A. Baranov, Denis G. Ghazaryan, Davit A. Arsenin, Aleksey V. Martin-Moreno, Luis (orcid)0000-0001-9273-8165 Volkov, Valentyn S. Novoselov, Kostya S. 15, 1 (2024), 1552 [8 pp.] Nature communications 2041-1723 2700933 http://zaguan.unizar.es/record/133301/files/texto_completo.pdf Versión publicada 2494648 http://zaguan.unizar.es/record/133301/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:133301 articulos driver 2026-02-17-20:26:28 ARTICLE