Quantum Oscillations in a Topological Insulator Bi${}_2$Te${}_2$Se with Large Bulk Resistivity (6 $\Omega$cm)

Abstract

We report the observation of prominent Shubnikov-de Haas oscillations in a Topological Insulator, Bi${}_2$Te${}_2$Se, with large bulk resistivity (6 $\Omega$cm at 4 K). By fitting the SdH oscillations, we infer a large metallicity parameter $k_F\ell$ = 41, with a surface mobility (${\mu }_s\sim$ 2,800 cm${}^2$/Vs) much larger than the bulk mobility (${\mu }_b\sim$ 50 cm${}^2$/Vs). The plot of the index fields $B_{\nu }$ vs. filling factor $\nu$ shows a $\frac{1}{2}$-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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