Optical conductivity of Bismuth-based topological insulator

Details Optical conductivity of Bismuth-based topological insulator Optical conductivity of Bismuth-based topological insulator

2012-01-26

arxiv.org/abs/1201.5609v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

The optical conductivity and the spectral weight (SW) of four topological insulators with increasing chemical compensation (Bi2Se3, Bi2-xCaxSe3, Bi2Se2Te, Bi2Te2Se) have been measured from 5 to 300 K and from sub-THz to visible frequencies. The effect of compensation is clearly observed in the infrared spectra, through the suppression of the Drude term and the appearance of strong peaks in the THz range, that we assign to electronic transitions among impurity states. In the most compensated sample (Bi2Te2Se), the far-infrared SW is higher than the spectral weight associated with topological states by nearly two orders of magnitude.

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