Quantum oscillations in a topological insulator Bi 2 Te 2 Se with large bulk resistivity (6 Ω cm)

By J. Xiong, A. Petersen, D. Qu, Y. Hor, R. Cava, N. Ong. 2011

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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 Ω cm at 4 K). By fitting the SdH oscillations, we infer a large metallicity parameter k F l =41, with a surface mobility ( μ s ∼ 2800 cm 2 / V s ) much larger than the bulk mobility ( μ b ∼ 50 cm 2 / V s ). The plot of the index fields B ν vs. filling factor ν shows a 1 2 - shift , consistent with massless, Dirac states.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics

View Paper: https://www.semanticscholar.org/paper/db440dc16136c85d14224d48e0f190d24809ff54