Topological Anomalous Hall Effect and Long-Range Spin Transport in Chiral Gold

Hall effect was observed for conduction through chiral gold film, without applying external magnetic field. The effect is related to the observation of long-range spin transport, that results in magnetoresistance signal up to a length of four micron, at room temperature. This length is consistent with frequency dependent Hall effect which indicates spin lifetime on the order of nanoseconds. The new type of Hall effect, termed topological anomalous Hall (TAH) effect is explained by the chirality induced spin selective scattering. A theoretical model is presented that involves the anisotropic electronic polarizability of the system, its spin orbit coupling, and spin exchange interactions.