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  • Electric field control photo-induced Hall currents in semiconductors

    Author(s)
    Miah, M Idrish
    Griffith University Author(s)
    Miah, Mohammad I.
    Year published
    2008
    Metadata
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    Abstract
    We generate spin-polarized carrier populations in GaAs and low temperature-grown GaAs (LT-GaAs) by circularly polarized optical beams and pull them by external electric fields to create spin-polarized currents. In the presence of the optically generated spin currents, anomalous Hall currents with an enhancement with increasing doping are observed and found to be almost steady in moderate electric fields up to not, vert, similar120 mV 孭1, indicating that photo-induced spin orientation of electrons is preserved in these systems. However, a field not, vert, similar300 mV 孭1 completely destroys the electron spin polarization due ...
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    We generate spin-polarized carrier populations in GaAs and low temperature-grown GaAs (LT-GaAs) by circularly polarized optical beams and pull them by external electric fields to create spin-polarized currents. In the presence of the optically generated spin currents, anomalous Hall currents with an enhancement with increasing doping are observed and found to be almost steady in moderate electric fields up to not, vert, similar120 mV 孭1, indicating that photo-induced spin orientation of electrons is preserved in these systems. However, a field not, vert, similar300 mV 孭1 completely destroys the electron spin polarization due to an increase of the D'yakonov-Perel' spin precession frequency of the hot electrons. This suggests that high field carrier transport conditions might not be suitable for spin-based technology with GaAs and LT-GaAs. It is also demonstrated that the presence of the excess arsenic sites in LT-GaAs might not affect the spin relaxation by Bir-Aronov-Pikus mechanism owing to a large number of electrons in n-doped materials.
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    Journal Title
    Materials Chemistry and Physics
    Volume
    111
    Issue
    2-3
    Publisher URI
    http://www.sciencedirect.com/science/journal/02540584
    DOI
    https://doi.org/10.1016/j.matchemphys.2008.03.038
    Subject
    Macromolecular and materials chemistry
    Chemical engineering not elsewhere classified
    Materials engineering
    Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/23459
    Collection
    • Journal articles

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