标题：Magneto-optical faraday and kerr effects in topological insulators Bi2Te3and Bi2Se3
作者：Wang, Xiao ;Lian, Jie ;Huang, Yue ;Sun, Zhaozong ;Liu, Junliang ;Zhang, Fujun ;Gao, Shang ;Yu, Xiaohong ;Li, Ping ;Zhao, Minglin
作者机构：[Wang, Xiao ;Lian, Jie ;Huang, Yue ;Sun, Zhaozong ;Liu, Junliang ;Zhang, Fujun ;Gao, Shang ;Yu, Xiaohong ;Li, Ping ;Zhao, Minglin ] Department of Opti 更多
来源：Japanese Journal of Applied Physics
摘要：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 Bi2Te3and 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 Bi2Te3film, 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 Bi2Te3is 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-lowfrequency area is larger than that of Bi2Te3. © 2013 The Japan Society of Applied Physics.