1 research outputs found
Faraday Rotation Due to Surface States in the Topological Insulator (Bi<sub>1–<i>x</i></sub>Sb<sub><i>x</i></sub>)<sub>2</sub>Te<sub>3</sub>
Using
magneto-infrared spectroscopy, we have explored the charge dynamics
of (Bi,Sb)<sub>2</sub>Te<sub>3</sub> 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