Oscillatory angular dependence of the magnetoresistance in a topological insulator Bi_{1-x}Sb_{x}

Details Oscillatory angular dependence of the magnetoresistance in a topological insulator Bi_{1-x}Sb_{x} Oscillatory angular dependence of the magnetoresistance in a topological insulator Bi_{1-x}Sb_{x}

2010-01-11

arxiv.org/abs/1001.1607v2

Physical Review B 82, 121302(R) (2010)

Physics

Condensed Matter

Materials Science

4 pages, 5 figures, revised version with improved data and analysis

Scientific paper

The angular-dependent magnetoresistance and the Shubnikov-de Haas oscillations are studied in a topological insulator Bi_{0.91}Sb_{0.09}, where the two-dimensional (2D) surface states coexist with a three-dimensional (3D) bulk Fermi surface (FS). Two distinct types of oscillatory phenomena are discovered in the angular-dependence: The one observed at lower fields is shown to originate from the surface state, which resides on the (2\bar{1}\bar{1}) plane, giving a new way to distinguish the 2D surface state from the 3D FS. The other one, which becomes prominent at higher fields, probably comes from the (111) plane and is obviously of unknown origin, pointing to new physics in transport properties of topological insulators.

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