Abstract
Three-dimensional topological insulator is a new quantum material which is insulating in the bulk but has current-carrying massless Dirac surface states. In this article, we investigate the magneto-optical properties of Bi2Te3 and Bi2Se3. Our analysis shows that the Faraday rotation can be affected by the magnetic coupling strength. The peak position shows a hypochromic shift with increasing magnetic coupling strength. There are two giant Kerr rotations with one (-π/2) in the low-frequency area and the other one in the non-low-frequency area. The spectral range of Kerr rotation reduces with increasing film thickness, magnetic coupling strength and incident angle. For the Bi2Se3 film, the giant Kerr rotation in the non-low-frequency area shows an obvious red shift. In addition, it is observed that the Faraday rotation peak position of Bi2Se3 is the same as that of Bi2Te3, so the Faraday rotation can be only determined by magnetic coupling strength. The giant Kerr rotation spectral range in the non-low-frequency area is larger than that of Bi2Te3.
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