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- W2792270147 abstract "We investigate the spin-to-charge conversion in highly doped germanium as a function of the kinetic energy of the carriers. Spin-polarized electrons are optically generated in the Ge conduction band, and their kinetic energy is varied by changing the photon energy in the 0.7--2.2 eV range. The spin detection scheme relies on spin-dependent scattering inside Ge, which yields an inverse spin-Hall electromotive force. The detected signal shows a sign inversion for $hensuremath{nu}ensuremath{approx}1phantom{rule{0.16em}{0ex}}mathrm{eV}$ which can be related to an interplay between the spin relaxation of high-energy electrons photoexcited from the heavy-hole and light-hole bands and that of low-energy electrons promoted from the split-off band. The inferred spin-Hall angle increases by about 3 orders of magnitude within the analyzed photon energy range. Since, for increasing photon energies, the phonon contribution to spin scattering exceeds that of impurities, our result indicates that the spin-to-charge conversion mediated by phonons is much more efficient than the one mediated by impurities." @default.
- W2792270147 created "2018-03-29" @default.
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- W2792270147 date "2018-03-19" @default.
- W2792270147 modified "2023-09-24" @default.
- W2792270147 title "Spin-to-charge conversion for hot photoexcited electrons in germanium" @default.
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- W2792270147 doi "https://doi.org/10.1103/physrevb.97.125203" @default.
- W2792270147 hasPublicationYear "2018" @default.
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