Terahertz response and colossal Kerr rotation from the surface states of the topological insulator Bi2Se3.

@article{Aguilar2012TerahertzRA,
  title={Terahertz response and colossal Kerr rotation from the surface states of the topological insulator Bi2Se3.},
  author={R Vald{\'e}s Aguilar and Andreas V. Stier and W. Liu and L S Bilbro and Deepu Koshy George and Namrata Bansal and Liang Wu and John Cernĕ and Andrea G. Markelz and S Oh and N Peter Armitage},
  journal={Physical review letters},
  year={2012},
  volume={108 8},
  pages={087403}
}
We report the THz response of thin films of the topological insulator Bi2Se3. At low frequencies, transport is essentially thickness independent showing the dominant contribution of the surface electrons. Despite their extended exposure to ambient conditions, these surfaces exhibit robust properties including narrow, almost thickness-independent Drude peaks, and an unprecedentedly large polarization rotation of linearly polarized light reflected in an applied magnetic field. This Kerr rotation… CONTINUE READING
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