Faraday rotation due to surface states in the topological insulator (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$

Abstract

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.

arXiv comment5 pages, accepted by Nano Lett (2016)

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Cited by in corpus (11)

• Optical Signatures of Dirac Nodal-lines in NbAs${}_2$
• Chiral Spin Mode on the Surface of a Topological Insulator
• Observation of Chiral Surface Excitons in a Topological Insulator Bi${}_2$Se${}_3$
• Interband absorption edge in topological insulators Bi${}_2$(Te${}_{1-x}$Se${}_x$)${}_3$
• Terahertz Faraday and Kerr rotation spectroscopy of Bi${}_{1-x}$Sb${}_x$ films in high magnetic fields up to 30 Tesla
• Band Structure of Two-dimensional Dirac Semimetal from Cyclotron Resonance
• Electron-Hole Asymmetry of Surface States in Topological Insulator Sb2Te3 Thin Films Revealed by Magneto-Infrared Spectroscopy
• Landau level spectroscopy of PbSnSe topological crystalline insulator
• Faraday rotation and transmittance as markers of topological phase transitions in 2D materials
• Topological Insulator Metamaterial with Giant Circular Photogalvanic Effect
• Observation of cyclotron antiresonance in the topological insulator Bi2Te3