Volume 117, Number 4, February 2017
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||18 April 2017|
The saturation of interband Faraday rotation in Bi2Se3
1 Laboratoire National des Champs Magnétiques Intenses, EMFL-CNRS-UGA-UPS-INSA 25, avenue des Martyrs, F-38042 Grenoble, France
2 Institute of Physics, Charles University - Ke Karlovu 5, CZ-121 16 Praha 2, Czech Republic
3 Institute of Applied Physics and Mathematics, Faculty of Chemical Technology, University of Pardubice Studentská 84, CZ-532 10 Pardubice, Czech Republic
4 Institute of Electronic Materials Technology - ul. Wolczynska 133, PL-01-919 Warsaw, Poland
Received: 13 January 2017
Accepted: 31 March 2017
Bismuth selenide – the prominent topological insulator – has been recently reported as a material exhibiting an extraordinary strong Faraday rotation. This effect has been identified as due to interband excitations in bulk promoting electrons from the valence to the conduction band, in which the electron gas is partially spin-polarized due to the Zeeman effect. In this work, we test the Faraday rotation in Bi2Se3 in high magnetic fields, when the conduction band electrons reach their full spin polarization. We find that the Faraday angle becomes in this regime almost independent of the applied magnetic field. This contrasts with the Faraday effect observed in this system at low magnetic fields, where the Faraday angle scales linearly with B and may thus be described by a conventional Verdet law.
PACS: 78.20.Ls – Magneto-optical effects / 71.28.+d – Narrow-band systems; intermediate-valence solids / 78.20.Fm – Birefringence
© EPLA, 2017
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