Quantum oscillations in a topological insulator Bi_{1-x}Sb_{x}

Details Quantum oscillations in a topological insulator Bi_{1-x}Sb_{x} Quantum oscillations in a topological insulator Bi_{1-x}Sb_{x}

2009-07-07

arxiv.org/abs/0907.1125v1

Phys. Rev. B 80, 085303 (2009)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

We have studied transport and magnetic properties of Bi_{1-x}Sb_x, which is believed to be a topological insulator - a new state of matter where an insulating bulk supports an intrinsically metallic surface. In nominally insulating Bi_{0.91}Sb_{0.09} crystals, we observed strong quantum oscillations of the magnetization and the resistivity originating from a Fermi surface which has a clear two-dimensional character. In addition, a three-dimensional Fermi surface is found to coexist, which is possibly due to an unusual coupling of the bulk to the surface. This finding demonstrates that quantum oscillations can be a powerful tool to directly probe the novel electronic states in topological insulators.

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