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, S. Schreyeck, C. Brune, H. Buhmann, L. W. Molenkamp,, and N. E. Hussey
TL;DR
This study investigates the anisotropic magneto-resistance in Bi2Se3, revealing strong negative magneto-resistance linked to the axial anomaly, suggesting broader implications for topological insulators and semi-metals.
Contribution
It demonstrates the presence of negative longitudinal magneto-resistance in Bi2Se3, indicating the axial anomaly's relevance beyond semi-metals to topological insulators.
Findings
Observation of quantum oscillations indicating bulk and surface carriers
Highly anisotropic magneto-resistance in Bi2Se3
Strong negative longitudinal magneto-resistance under parallel E and B fields
Abstract
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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