Faraday Rotation Due to Surface States in the Topological Insulator (Bi1-xSbx)2Te3

Yinming Shao*, Kirk W. Post, Jhih Sheng Wu, Siyuan Dai, Alex J. Frenzel, Anthony R. Richardella, Joon Sue Lee, Nitin Samarth, Michael M. Fogler, Alexander V. Balatsky, Dmitri E. Kharzeev, D. N. Basov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Using magneto-infrared spectroscopy, we have explored the charge dynamics of (Bi,Sb)2Te3 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.

Original languageEnglish
Pages (from-to)980-984
Number of pages5
JournalNano letters
Volume17
Issue number2
DOIs
StatePublished - 8 Feb 2017

Keywords

  • Bismuth antimony telluride
  • cyclotron resonance
  • Faraday rotation
  • topological insulators
  • topological surface states

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