Terahertz Faraday and Kerr rotation spectroscopy of Bi1−xSbx films in high magnetic fields up to 30 tesla

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dc.citation.articleNumber115145en_US
dc.citation.issueNumber11en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber100en_US
dc.contributor.authorLi, Xinweien_US
dc.contributor.authorYoshioka, Katsumasaen_US
dc.contributor.authorXie, Mingen_US
dc.contributor.authorNoe, G. Timothyen_US
dc.contributor.authorLee, Woojooen_US
dc.contributor.authorMarquez Peraca, Nicolasen_US
dc.contributor.authorGao, Weiluen_US
dc.contributor.authorHagiwara, Toshioen_US
dc.contributor.authorHandegård, Ørjan S.en_US
dc.contributor.authorNien, Li-Weien_US
dc.contributor.authorNagao, Tadaakien_US
dc.contributor.authorKitajima, Masahiroen_US
dc.contributor.authorNojiri, Hiroyukien_US
dc.contributor.authorShih, Chih-Kangen_US
dc.contributor.authorMacDonald, Allan H.en_US
dc.contributor.authorKatayama, Ikufumien_US
dc.contributor.authorTakeda, Junen_US
dc.contributor.authorFiete, Gregory A.en_US
dc.contributor.authorKono, Junichiroen_US
dc.date.accessioned2019-10-23T15:55:35Zen_US
dc.date.available2019-10-23T15:55:35Zen_US
dc.date.issued2019en_US
dc.description.abstractWe report results of terahertz Faraday and Kerr rotation spectroscopy measurements on thin films of Bi1−xSbx, an alloy system that exhibits a semimetal-to-topological-insulator transition as the Sb composition x increases. By using a single-shot time-domain terahertz spectroscopy setup combined with a table-top pulsed minicoil magnet, we conducted measurements in magnetic fields up to 30 T, observing distinctly different behaviors between semimetallic (x<0.07) and topological insulator (x>0.07) samples. Faraday and Kerr rotation spectra for the semimetallic films showed a pronounced dip that blueshifted with the magnetic field, whereas spectra for the topological insulator films were positive and featureless, increasing in amplitude with increasing magnetic field and eventually saturating at high fields (>20 T). Ellipticity spectra for the semimetallic films showed resonances, whereas the topological insulator films showed no detectable ellipticity. To explain these observations, we developed a theoretical model based on realistic band parameters and the Kubo formula for calculating the optical conductivity of Landau-quantized charge carriers. Our calculations quantitatively reproduced all experimental features, establishing that the Faraday and Kerr signals in the semimetallic films predominantly arise from bulk hole cyclotron resonances while the signals in the topological insulator films represent combined effects of surface carriers originating from multiple electron and hole pockets. These results demonstrate that the use of high magnetic fields in terahertz magnetopolarimetry, combined with detailed electronic structure and conductivity calculations, allows us to unambiguously identify and quantitatively determine unique contributions from different species of carriers of topological and nontopological nature in Bi1−xSbx.en_US
dc.identifier.citationLi, Xinwei, Yoshioka, Katsumasa, Xie, Ming, et al.. "Terahertz Faraday and Kerr rotation spectroscopy of Bi1−xSbx films in high magnetic fields up to 30 tesla." <i>Physical Review B,</i> 100, no. 11 (2019) American Physical Society: https://doi.org/10.1103/PhysRevB.100.115145.en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.100.115145en_US
dc.identifier.urihttps://hdl.handle.net/1911/107496en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Physical Society.en_US
dc.titleTerahertz Faraday and Kerr rotation spectroscopy of Bi1−xSbx films in high magnetic fields up to 30 teslaen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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