Aging and reduced bulk conductance in thin films of the topological insulator Bi$_2$Se$_3$

Details Aging and reduced bulk conductance in thin films of the topological insulator Bi$_2$Se$_3$ Aging and reduced bulk conductance in thin films of the topological insulator Bi$_2$Se$_3$

2012-02-06

arxiv.org/abs/1202.1249v2

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 3 figures. 4 pages, modified text

Scientific paper

We report on the effect of exposure to atmospheric conditions on the THz conductivity of thin films of the topological insulator Bi$_2$Se$_3$. We find: 1) two contributions of mobile charge carriers to the THz conductivity immediately after growth, and 2) the spectral weight of the smaller of these decays significantly over a period of several days as the film is exposed to ambient conditions, while the other remains relatively constant. We associate the former with a bulk response, and the latter with the surface. The surface response exhibits the expected robustness of the carriers from 2D topological surface states. We find no evidence for a third spectral feature derived from topologically trivial surface states.

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