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- W2052646855 abstract "The ballistic movement of spin-polarized electrons in a semiconductor is spatially and temporally resolved. Pure spin currents are injected into $mathrm{GaAs}$ quantum wells at $80phantom{rule{0.3em}{0ex}}mathrm{K}$ by optical quantum interference processes, and the subsequent ballistic transport is measured by pump-probe techniques having $ensuremath{sim}200phantom{rule{0.3em}{0ex}}mathrm{fs}$ temporal and $ensuremath{sim}1phantom{rule{0.3em}{0ex}}mathrm{nm}$ spatial resolution. An average injection velocity of $ensuremath{sim}50phantom{rule{0.3em}{0ex}}mathrm{nm}∕mathrm{ps}$ and spin momentum relaxation times ranging from 1.2 to $0.6phantom{rule{0.3em}{0ex}}mathrm{ps}$ are extracted for carrier densities varying from 1.5 to $12ifmmodetimeselsetexttimesfi{}{10}^{16}phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}3}$ when the electrons are excited into the conduction band with excess energy $ensuremath{sim}25phantom{rule{0.3em}{0ex}}mathrm{meV}$, less than that of one optical phonon." @default.
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- W2052646855 date "2007-02-05" @default.
- W2052646855 modified "2023-09-25" @default.
- W2052646855 title "Temporally and spatially resolved ballistic pure spin transport" @default.
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- W2052646855 doi "https://doi.org/10.1103/physrevb.75.075305" @default.
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