paper

Quantum Oscillations in a Topological Insulator BiTeSe with Large Bulk Resistivity (6 cm)

arXiv:1101.1315 · doi:10.1016/j.physe.2011.09.011

Abstract

We report the observation of prominent Shubnikov-de Haas oscillations in a Topological Insulator, BiTeSe, with large bulk resistivity (6 cm at 4 K). By fitting the SdH oscillations, we infer a large metallicity parameter = 41, with a surface mobility ( 2,800 cm/Vs) much larger than the bulk mobility ( 50 cm/Vs). The plot of the index fields vs. filling factor shows a -shift, consistent with massless, Dirac states. Evidence for fractional-filling states is seen in an 11-T field.

4 pages, 5 figures

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