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dc.contributor.authorYin, Junen
dc.contributor.authorAdamo, Giorgioen
dc.contributor.authorChong, Yidongen
dc.contributor.authorSoci, Cesareen
dc.contributor.authorKrishnamoorthy, Harish Natarajan Swahaen
dc.contributor.authorDubrovkin, Alexander M.en
dc.contributor.authorZheludev, Nikolay I.en
dc.identifier.citationYin, J., Krishnamoorthy, H. N. S., Adamo, G., Dubrovkin, A. M., Chong, Y., Zheludev, N. I., & Soci, C. (2017). Plasmonics of topological insulators at optical frequencies. NPG Asia Materials, 9(8), e425-. doi:10.1038/am.2017.149en
dc.description.abstractThe development of nanoplasmonic devices, such as plasmonic circuits and metamaterial superlenses in the visible to ultraviolet frequency range, is hampered by the lack of low-loss plasmonic media. Recently, strong plasmonic response was reported in a certain class of topological insulators. Here, we present a first-principles density functional theory analysis of the dielectric functions of topologically insulating quaternary (Bi,Sb)2(Te,Se)3 trichalcogenide compounds. Bulk plasmonic properties, dominated by interband transitions, are observed from 2 to 3 eV and extend to higher frequencies. Moreover, trichalcogenide compounds are better plasmonic media than gold and silver at blue and UV wavelengths. By analyzing thin slabs, we also show that these materials exhibit topologically protected surface states, which are capable of supporting propagating plasmon polariton modes over an extremely broad spectral range, from the visible to the mid-infrared and beyond, owing to a combination of inter- and intra-surface band transitions.en
dc.description.sponsorshipMOE (Min. of Education, S’pore)en
dc.format.extent8 p.en
dc.relation.ispartofseriesNPG Asia Materialsen
dc.rights© 2017 The Author(s) (Nature Publishing Group). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
dc.subjectTopological Insulatorsen
dc.titlePlasmonics of topological insulators at optical frequenciesen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen
dc.contributor.researchCentre for Disruptive Photonic Technologies (CDPT)en
dc.contributor.researchThe Photonics Instituteen
dc.description.versionPublished versionen
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