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Mapping spin-orbit splitting in strained (In,Ga)As epilayers

Source: Phys. Rev. B 82, 081304 (2010); doi:10.1103/PhysRevB.82.081304

Published 6 August 2010

PACS
  • 72.25.Dc
    Spin polarized transport in semiconductors
  • 72.25.Rb
    Spin relaxation and scattering (spin polarized transport)
  • 71.70.Ej
    Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect (condensed matter)
  • 71.70.Fk
    Strain-induced splitting (condensed matter)
  • YEAR: 2010
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
B. M. Norman,1 C. J. Trowbridge,1 J. Stephens,2 A. C. Gossard,2 D. D. Awschalom,2 and V. Sih1
1Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
2Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA
Time-resolved and spatially resolved Faraday rotation spectroscopy is used to measure the magnitude and direction of the momentum-dependent spin splitting in strained InGaAs epilayers. The epilayers are coherently strained and therefore designed to reduce inhomogeneous effects related to strain relaxation. Measurements of momentum-dependent spin splitting as a function of electron spin drift velocity along [100], [010], [110], and [1[overline 1]0] directions enable separation of isotropic and anisotropic effective magnetic fields that arise from uniaxial and biaxial strain along <110>. We find that the anisotropic and isotropic strain-induced effective magnetic fields are comparable in magnitude, contrary to previous predictions. ©2010 The American Physical Society
History: Received 28 June 2010; published 6 August 2010
Permalink: http://link.aps.org/abstract/PRB/v82/e081304
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