Topological charge pumping effect by the magnetization dynamics on the Surface of Three-Dimensional Topological Insulators

Details Topological charge pumping effect by the magnetization dynamics on the Surface of Three-Dimensional Topological Insulators Topological charge pumping effect by the magnetization dynamics on the Surface of Three-Dimensional Topological Insulators

2011-09-30

arxiv.org/abs/1109.6816v2

Phys. Rev. B 85, 115110 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.85.115110

We discuss a current dynamics on the surface of a 3-dimensional topological insulator induced by magnetization precession of a ferromagnet attached. It is found that the magnetization dynamics generates a direct charge current when the precession axis is within the surface plane. This rectification effect is due to a quantum anomaly and is topologically protected. The robustness of the rectification effect against first-varying exchange field and impurities is confirmed by explicit calculation.

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