{"citation":{"mla":"Duan, J., et al. “Enabling Propagation of Anisotropic Polaritons along Forbidden Directions via a Topological Transition.” <i>Science Advances</i>, vol. 7, no. 14, eabf2690, AAAS, 2021, doi:<a href=\"https://doi.org/10.1126/sciadv.abf2690\">10.1126/sciadv.abf2690</a>.","apa":"Duan, J., Álvarez-Pérez, G., Voronin, K. V., Prieto Gonzalez, I., Taboada-Gutiérrez, J., Volkov, V. S., … Alonso-González, P. (2021). Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition. <i>Science Advances</i>. AAAS. <a href=\"https://doi.org/10.1126/sciadv.abf2690\">https://doi.org/10.1126/sciadv.abf2690</a>","short":"J. Duan, G. Álvarez-Pérez, K.V. Voronin, I. Prieto Gonzalez, J. Taboada-Gutiérrez, V.S. Volkov, J. Martín-Sánchez, A.Y. Nikitin, P. Alonso-González, Science Advances 7 (2021).","chicago":"Duan, J., G. Álvarez-Pérez, K. V. Voronin, Ivan Prieto Gonzalez, J. Taboada-Gutiérrez, V. S. Volkov, J. Martín-Sánchez, A. Y. Nikitin, and P. Alonso-González. “Enabling Propagation of Anisotropic Polaritons along Forbidden Directions via a Topological Transition.” <i>Science Advances</i>. AAAS, 2021. <a href=\"https://doi.org/10.1126/sciadv.abf2690\">https://doi.org/10.1126/sciadv.abf2690</a>.","ieee":"J. Duan <i>et al.</i>, “Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition,” <i>Science Advances</i>, vol. 7, no. 14. AAAS, 2021.","ama":"Duan J, Álvarez-Pérez G, Voronin KV, et al. Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition. <i>Science Advances</i>. 2021;7(14). doi:<a href=\"https://doi.org/10.1126/sciadv.abf2690\">10.1126/sciadv.abf2690</a>","ista":"Duan J, Álvarez-Pérez G, Voronin KV, Prieto Gonzalez I, Taboada-Gutiérrez J, Volkov VS, Martín-Sánchez J, Nikitin AY, Alonso-González P. 2021. Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition. Science Advances. 7(14), eabf2690."},"_id":"9334","month":"04","title":"Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"14","department":[{"_id":"NanoFab"}],"external_id":{"isi":["000636455600027"],"pmid":["33811076"]},"publication":"Science Advances","oa_version":"Published Version","status":"public","year":"2021","article_type":"original","scopus_import":"1","ddc":["530"],"volume":7,"date_updated":"2023-08-08T13:11:31Z","date_published":"2021-04-02T00:00:00Z","publication_status":"published","quality_controlled":"1","author":[{"first_name":"J.","last_name":"Duan","full_name":"Duan, J."},{"full_name":"Álvarez-Pérez, G.","first_name":"G.","last_name":"Álvarez-Pérez"},{"last_name":"Voronin","first_name":"K. V.","full_name":"Voronin, K. V."},{"id":"2A307FE2-F248-11E8-B48F-1D18A9856A87","last_name":"Prieto Gonzalez","first_name":"Ivan","full_name":"Prieto Gonzalez, Ivan","orcid":"0000-0002-7370-5357"},{"full_name":"Taboada-Gutiérrez, J.","first_name":"J.","last_name":"Taboada-Gutiérrez"},{"first_name":"V. S.","last_name":"Volkov","full_name":"Volkov, V. S."},{"last_name":"Martín-Sánchez","first_name":"J.","full_name":"Martín-Sánchez, J."},{"full_name":"Nikitin, A. Y.","first_name":"A. Y.","last_name":"Nikitin"},{"full_name":"Alonso-González, P.","first_name":"P.","last_name":"Alonso-González"}],"type":"journal_article","intvolume":"         7","publication_identifier":{"eissn":["23752548"]},"tmp":{"image":"/images/cc_by_nc.png","legal_code_url":"https://creativecommons.org/licenses/by-nc/4.0/legalcode","short":"CC BY-NC (4.0)","name":"Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)"},"abstract":[{"lang":"eng","text":"Polaritons with directional in-plane propagation and ultralow losses in van der Waals (vdW) crystals promise unprecedented manipulation of light at the nanoscale. However, these polaritons present a crucial limitation: their directional propagation is intrinsically determined by the crystal structure of the host material, imposing forbidden directions of propagation. Here, we demonstrate that directional polaritons (in-plane hyperbolic phonon polaritons) in a vdW crystal (α-phase molybdenum trioxide) can be directed along forbidden directions by inducing an optical topological transition, which emerges when the slab is placed on a substrate with a given negative permittivity (4H–silicon carbide). By visualizing the transition in real space, we observe exotic polaritonic states between mutually orthogonal hyperbolic regimes, which unveil the topological origin of the transition: a gap opening in the dispersion. This work provides insights into optical topological transitions in vdW crystals, which introduce a route to direct light at the nanoscale."}],"acknowledgement":"G.Á.-P. and J.T.-G. acknowledge support through the Severo Ochoa Program from the government of the Principality of Asturias (grant nos. PA20-PF-BP19-053 and PA-18-PF-BP17-126, respectively). K.V.V. and V.S.V. acknowledge the Ministry of Science and Higher Education of the Russian Federation (no. 0714-2020-0002). J. M.-S. acknowledges financial support through the Ramón y Cajal Program from the government of Spain and FSE (RYC2018-026196-I). A.Y.N. acknowledges the Spanish Ministry of Science, Innovation and Universities (national project no. MAT201788358-C3-3-R), and the Basque Department of Education (PIBA-2020-1-0014). P.A.-G. acknowledges support from the European Research Council under starting grant no. 715496, 2DNANOPTICA. ","date_created":"2021-04-18T22:01:42Z","pmid":1,"language":[{"iso":"eng"}],"license":"https://creativecommons.org/licenses/by-nc/4.0/","oa":1,"publisher":"AAAS","file":[{"date_updated":"2021-04-19T11:17:29Z","file_size":717489,"date_created":"2021-04-19T11:17:29Z","creator":"dernst","relation":"main_file","access_level":"open_access","checksum":"4b383d4a1d484a71bbc64ecf401bbdbb","file_id":"9343","file_name":"2021_ScienceAdv_Duan.pdf","content_type":"application/pdf","success":1}],"doi":"10.1126/sciadv.abf2690","file_date_updated":"2021-04-19T11:17:29Z","article_number":"eabf2690","has_accepted_license":"1","day":"02","article_processing_charge":"No","isi":1}