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Proceedings Paper

Detection of the anomalous velocity and anomalous Hall effect in GaAs via free-space THz spectroscopy
Author(s): Mark Bieler; Christian B. Schmidt; Shekhar Priyadarshi; Klaus Pierz
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Paper 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.

Paper Details

Date Published: 14 September 2018
PDF: 9 pages
Proc. SPIE 10756, Terahertz Emitters, Receivers, and Applications IX, 107560L (14 September 2018); doi: 10.1117/12.2319164
Show Author Affiliations
Mark Bieler, Physikalisch-Technische Bundesanstalt (Germany)
Christian B. Schmidt, Physikalisch-Technische Bundesanstalt (Germany)
Leibniz Institute of Photonic Technology (Germany)
Shekhar Priyadarshi, Physikalisch-Technische Bundesanstalt (Germany)
Univ. of Hamburg (Germany)
Klaus Pierz, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 10756:
Terahertz Emitters, Receivers, and Applications IX
Manijeh Razeghi; Alexei N. Baranov, Editor(s)

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