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

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dc.citation.articleNumber115145
dc.citation.issueNumber11
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber100
dc.contributor.authorLi, Xinwei
dc.contributor.authorYoshioka, Katsumasa
dc.contributor.authorXie, Ming
dc.contributor.authorNoe, G. Timothy
dc.contributor.authorLee, Woojoo
dc.contributor.authorMarquez Peraca, Nicolas
dc.contributor.authorGao, Weilu
dc.contributor.authorHagiwara, Toshio
dc.contributor.authorHandegård, Ørjan S.
dc.contributor.authorNien, Li-Wei
dc.contributor.authorNagao, Tadaaki
dc.contributor.authorKitajima, Masahiro
dc.contributor.authorNojiri, Hiroyuki
dc.contributor.authorShih, Chih-Kang
dc.contributor.authorMacDonald, Allan H.
dc.contributor.authorKatayama, Ikufumi
dc.contributor.authorTakeda, Jun
dc.contributor.authorFiete, Gregory A.
dc.contributor.authorKono, Junichiro
dc.date.accessioned2019-10-23T15:55:35Z
dc.date.available2019-10-23T15:55:35Z
dc.date.issued2019
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.
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.
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.100.115145
dc.identifier.urihttps://hdl.handle.net/1911/107496
dc.language.isoeng
dc.publisherAmerican Physical Society
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.
dc.titleTerahertz Faraday and Kerr rotation spectroscopy of Bi1−xSbx films in high magnetic fields up to 30 tesla
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpost-print
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