Faraday Rotation Due to Surface States in the Topological Insulator (Bi 1-x Sb x ) 2 Te 3 .

Autor: Shao Y; Department of Physics, Columbia University , New York, New York 10027, United States., Post KW; Physics Department, University of California-San Diego , La Jolla, California 92093, United States., Wu JS; Physics Department, University of California-San Diego , La Jolla, California 92093, United States., Dai S; Physics Department, University of California-San Diego , La Jolla, California 92093, United States., Frenzel AJ; Physics Department, University of California-San Diego , La Jolla, California 92093, United States., Richardella AR; Department of Physics, The Pennsylvania State University , University Park, Pennsylvania 16802, United States., Lee JS; Department of Physics, The Pennsylvania State University , University Park, Pennsylvania 16802, United States., Samarth N; Department of Physics, The Pennsylvania State University , University Park, Pennsylvania 16802, United States., Fogler MM; Physics Department, University of California-San Diego , La Jolla, California 92093, United States., Balatsky AV; 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., Kharzeev DE; 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., Basov DN; 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.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2017 Feb 08; Vol. 17 (2), pp. 980-984. Date of Electronic Publication: 2017 Jan 05.
DOI: 10.1021/acs.nanolett.6b04313
Abstrakt: 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.
Databáze: MEDLINE