Detection of the anomalous velocity and anomalous Hall effect in GaAs via free-space THz spectroscopy

Mark Bieler; Christian B. Schmidt; Shekhar Priyadarshi; Klaus Pierz

doi:10.1117/12.2319164

14 September 2018 Detection of the anomalous velocity and anomalous Hall effect in GaAs via free-space THz spectroscopy

Mark Bieler, Christian B. Schmidt, Shekhar Priyadarshi, Klaus Pierz

Proceedings Volume 10756, Terahertz Emitters, Receivers, and Applications IX; 107560L (2018) https://doi.org/10.1117/12.2319164
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

The anomalous velocity causes spin-polarized carriers to move perpendicular to an electric or parallel to a magnetic driving field. It is at the origin of the spin Hall and anomalous Hall effects. Here, we employ time-domain THz spectroscopy to study the anomalous velocity and the anomalous Hall effect, both of which are optically induced in GaAs, on a sub-picosecond time scale. Our results not only enable a distinction between intrinsic (Berry curvature) and extrinsic (scattering) effects but also demonstrate an inversion of anomalous Hall currents versus excitation photon energy.

Citation Download Citation

Mark Bieler, Christian B. Schmidt, Shekhar Priyadarshi, and Klaus Pierz "Detection of the anomalous velocity and anomalous Hall effect in GaAs via free-space THz spectroscopy", Proc. SPIE 10756, Terahertz Emitters, Receivers, and Applications IX, 107560L (14 September 2018); https://doi.org/10.1117/12.2319164

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