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.

5 pages, accepted by Nano Lett (2016)

References in corpus (11)

• Topological Field Theory of Time-Reversal Invariant Insulators
• Magneto-optical conductivity in Graphene
• Electrodynamics of Correlated Electron Materials
• Giant Faraday rotation in single- and multilayer graphene
• Infrared spectroscopy of Landau levels in graphene
• Exciton condensation and charge fractionalization in a topological insulator film
• Optical Hall conductivity in ordinary and graphene QHE systems
• Quasi-classical cyclotron resonance of Dirac fermions in highly doped graphene
• Universal Faraday rotation in HgTe wells with critical thickness
• Magneto-optical Kramers-Kronig analysis
• Classical to quantum crossover of the cyclotron resonance in graphene: A study of the strength of intraband absorption

Cited by in corpus (7)

• Chiral Spin Mode on the Surface of a Topological Insulator
• Observation of Chiral Surface Excitons in a Topological Insulator Bi${}_2$Se${}_3$
• 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