Giant plateau in the terahertz Faraday angle in gated Bi2Se 3

Gregory S. Jenkins, Andrei B. Sushkov, Don C. Schmadel, M. H. Kim, Matthew Brahlek, Namrata Bansal, Seongshik Oh, H. Dennis Drew

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Abstract

We report gated terahertz Faraday angle measurements on epitaxial Bi 2Se3 thin films capped with In2Se3. A plateau is observed in the real part of the Faraday angle at an onset gate voltage corresponding to no band bending at the surface, which persists into accumulation. The plateau is two orders of magnitude flatter than the step size expected from a single Landau level in the low-frequency limit, quantized in units of the fine structure constant. At 8 T, the plateau extends over a range of gate voltage that spans an electron density greater than 14 times the quantum flux density. Both the imaginary part of the Faraday angle and transmission measurements indicate dissipative off-axis and longitudinal conductivity channels associated with the plateau.

Original languageEnglish
Article number235133
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number23
DOIs
StatePublished - Dec 19 2012

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