Abstract
We report the first terahertz Kerr measurements on bulk crystals of the topological insulator . At and fields up to 8 T, the real and imaginary Kerr angle and reflectance measurements utilizing both linearly and circularly polarized incident radiation were measured at a frequency of 5.24 meV. A single fluid free carrier bulk response cannot describe the line shape. Data from one sample is quantitatively described by a surface state with a small mass and surprisingly large associated spectral weight. However, an alternative interpretation in terms of bulk carrier-density variations remains a possibility
- Received 31 July 2010
DOI:https://doi.org/10.1103/PhysRevB.82.125120
©2010 American Physical Society