title: Faraday Rotation Due to Surface States in the Topological Insulator (Bi1-xSbx)2Te3.
abstract: Using magneto-infrared spectroscopy, we have explored the charge dynamics of (Bi,Sb)2Te3thin 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.
authors.affiliation: Department of Physics, Columbia University , New York, New York 10027, United States.
authors.forename: Yinming
authors.identifier: 0000-0002-2891-0028
authors.initials: Y
authors.lastname: Shao
authors.affiliation: Physics Department, University of California-San Diego , La Jolla, California 92093, United States.
authors.forename: Kirk W
authors.initials: KW
authors.lastname: Post
authors.affiliation: Physics Department, University of California-San Diego , La Jolla, California 92093, United States.
authors.forename: Jhih-Sheng
authors.initials: JS
authors.lastname: Wu
authors.affiliation: Physics Department, University of California-San Diego , La Jolla, California 92093, United States.
authors.forename: Siyuan
authors.initials: S
authors.lastname: Dai
authors.affiliation: Physics Department, University of California-San Diego , La Jolla, California 92093, United States.
authors.forename: Alex J
authors.initials: AJ
authors.lastname: Frenzel
authors.affiliation: Department of Physics, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Anthony R
authors.initials: AR
authors.lastname: Richardella
authors.affiliation: Department of Physics, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Joon Sue
authors.initials: JS
authors.lastname: Lee
authors.affiliation: Department of Physics, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Nitin
authors.initials: N
authors.lastname: Samarth
authors.affiliation: Physics Department, University of California-San Diego , La Jolla, California 92093, United States.
authors.forename: Michael M
authors.initials: MM
authors.lastname: Fogler
authors.affiliation: Nordita, KTH Royal Institute of Technology and Stockholm University , Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden.|Institute for Materials Science, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Balatsky
authors.affiliation: Department of Physics and Astronomy, Stony Brook University , Stony Brook, New York 11794-3800, United States.|Department of Physics and RIKEN-BNL Research Center, Brookhaven National Laboratory , Upton, New York 11973, United States.
authors.forename: Dmitri E
authors.initials: DE
authors.lastname: Kharzeev
authors.affiliation: Department of Physics, Columbia University , New York, New York 10027, United States.|Physics Department, University of California-San Diego , La Jolla, California 92093, United States.
authors.forename: D N
authors.initials: DN
authors.lastname: Basov
keywords: Bismuth antimony telluride; Faraday rotation; cyclotron resonance; topological insulators; topological surface states