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Observation of Intrinsic Inverse Spin Hall Effect

Lalani K. Werake, Brian A. Ruzicka, and Hui Zhao
Phys. Rev. Lett. 106, 107205 – Published 9 March 2011
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Abstract

We report observation of intrinsic inverse spin Hall effect in undoped GaAs multiple quantum wells with a sample temperature of 10 K. A transient ballistic pure spin current is injected by a pair of laser pulses through quantum interference. By time resolving the dynamics of the pure spin current, the momentum relaxation time is deduced, which sets the lower limit of the scattering time between electrons and holes. The transverse charge current generated by the pure spin current via the inverse spin Hall effect is simultaneously resolved. We find that the charge current is generated well before the first electron-hole scattering event. Generation of the transverse current in the scattering-free ballistic transport regime provides unambiguous evidence for the intrinsic inverse spin Hall effect.

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  • Received 18 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.107205

© 2011 American Physical Society

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Electrons Curve without Help

Published 25 February 2011

Experiments show that the spin of an electron can cause its path to curve as it moves through a semiconductor, even in the absence of scattering, which may be important for future devices.

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Authors & Affiliations

Lalani K. Werake, Brian A. Ruzicka, and Hui Zhao*

  • Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, USA

  • *Corresponding author. huizhao@ku.edu

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Issue

Vol. 106, Iss. 10 — 11 March 2011

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