1109.6816 (Hiroaki T. Ueda et al.)

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

Hiroaki T. Ueda, Akihito Takeuchi, Gen Tatara, Takehito Yokoyama

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.

View original: http://arxiv.org/abs/1109.6816