000133301 001__ 133301 000133301 005__ 20240410085329.0 000133301 0247_ $$2doi$$a10.1038/s41467-024-45266-3 000133301 0248_ $$2sideral$$a137950 000133301 037__ $$aART-2024-137950 000133301 041__ $$aeng 000133301 100__ $$aErmolaev, Georgy A. 000133301 245__ $$aWandering principal optical axes in van der Waals triclinic materials 000133301 260__ $$c2024 000133301 5060_ $$aAccess copy available to the general public$$fUnrestricted 000133301 5203_ $$aNature 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. 000133301 536__ $$9info:eu-repo/grantAgreement/ES/DGA/Q-MAD 000133301 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/ 000133301 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000133301 700__ $$aVoronin, Kirill V. 000133301 700__ $$aToksumakov, Adilet N. 000133301 700__ $$aGrudinin, Dmitriy V. 000133301 700__ $$aFradkin, Ilia M. 000133301 700__ $$aMazitov, Arslan 000133301 700__ $$aSlavich, Aleksandr S. 000133301 700__ $$aTatmyshevskiy, Mikhail K. 000133301 700__ $$aYakubovsky, Dmitry I. 000133301 700__ $$aSolovey, Valentin R. 000133301 700__ $$aKirtaev, Roman V. 000133301 700__ $$aNovikov, Sergey M. 000133301 700__ $$aZhukova, Elena S. 000133301 700__ $$aKruglov, Ivan 000133301 700__ $$aVyshnevyy, Andrey A. 000133301 700__ $$aBaranov, Denis G. 000133301 700__ $$aGhazaryan, Davit A. 000133301 700__ $$aArsenin, Aleksey V. 000133301 700__ $$0(orcid)0000-0001-9273-8165$$aMartin-Moreno, Luis 000133301 700__ $$aVolkov, Valentyn S. 000133301 700__ $$aNovoselov, Kostya S. 000133301 773__ $$g15, 1 (2024), 1552 [8 pp.]$$tNature communications$$x2041-1723 000133301 8564_ $$s2700933$$uhttps://zaguan.unizar.es/record/133301/files/texto_completo.pdf$$yVersión publicada 000133301 8564_ $$s2494648$$uhttps://zaguan.unizar.es/record/133301/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000133301 909CO $$ooai:zaguan.unizar.es:133301$$particulos$$pdriver 000133301 951__ $$a2024-04-10-08:39:03 000133301 980__ $$aARTICLE