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Anisotropic and strong negative magneto-resistance in the three-dimensional topological insulator Bi2Se3

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arxiv 1608.03615 v1 pith:PLHNIDLV submitted 2016-08-11 cond-mat.mes-hall

Anisotropic and strong negative magneto-resistance in the three-dimensional topological insulator Bi2Se3

S. Wiedmann , A. Jost , B. Fauque , J. van Dijk , M. J. Meijer , T. Khouri , S. Pezzini , S. Grauer
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S. Schreyeck C. Brune H. Buhmann L. W. Molenkamp N. E. Hussey
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classification cond-mat.mes-hall
keywords bi2se3insulatorpresencethree-dimensionaltopologicalanisotropicanomalyaxial
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We report on high-field angle-dependent magneto-transport measurements on epitaxial thin films of Bi2Se3, a three-dimensional topological insulator. At low temperature, we observe quantum oscillations that demonstrate the simultaneous presence of bulk and surface carriers. The magneto- resistance of Bi2Se3 is found to be highly anisotropic. In the presence of a parallel electric and magnetic field, we observe a strong negative longitudinal magneto-resistance that has been consid- ered as a smoking-gun for the presence of chiral fermions in a certain class of semi-metals due to the so-called axial anomaly. Its observation in a three-dimensional topological insulator implies that the axial anomaly may be in fact a far more generic phenomenon than originally thought.

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