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Faraday Rotation Due to Surface States in the Topological Insulator (Bi1-xSbx)(2)Te-3
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2017 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 17, no 2, 980-984 p.Article in journal (Refereed) Published
Abstract [en]

Using magneto-infrared spectroscopy, we have explored the charge dynamics of (Bi,Sb)(2)Te-3 thin films on InP substrates. From the magneto-transmission data we extracted three distinct cyclotron resonance (CR) energies that are all apparent in the broad band Faraday rotation (FR) spectra. This comprehensive FR-CR data set has allowed us to isolate the response of the bulk states from the intrinsic surface states associated with both the top and bottom surfaces of the film. The FR data uncovered that electron- and hole-type Dirac Fermions reside on opposite surfaces of our films, which paves the way for observing many exotic quantum phenomena in topological insulators.

Place, publisher, year, edition, pages
2017. Vol. 17, no 2, 980-984 p.
Keyword [en]
Bismuth antimony telluride, topological insulators, cyclotron resonance, Faraday rotation, topological surface states
National Category
Chemical Sciences Nano Technology Materials Engineering Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-141368DOI: 10.1021/acs.nanolett.6b04313ISI: 000393848800053PubMedID: 28030948OAI: oai:DiVA.org:su-141368DiVA: diva2:1092287
Available from: 2017-05-02 Created: 2017-05-02 Last updated: 2017-10-03Bibliographically approved

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Balatsky, Alexander V.
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Nordic Institute for Theoretical Physics (Nordita)
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