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

11 Aug 2016  ·  Wiedmann S., Jost A., Fauque B., van Dijk J., Meijer M. J., Khouri T., Pezzini S., Grauer S., Schreyeck S., Brune C., Buhmann H., Molenkamp L. W., Hussey N. E. ·

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. read more

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Mesoscale and Nanoscale Physics