Pure spin currents in Ge probed by inverse spin-Hall effect | Zendy

Federico Bottegoni | Zendy; Carlo Zucchetti | Zendy; Marco Finazzi | Zendy; Giovanni Isella | Zendy; F. Ciccacci | Zendy

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Pure spin currents in Ge probed by inverse spin-Hall effect

Author(s) -

Federico Bottegoni,

Carlo Zucchetti,

Marco Finazzi,

Giovanni Isella,

F. Ciccacci

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4973392

Subject(s) - condensed matter physics , spin hall effect , electron , brillouin zone , spin polarization , spin (aerodynamics) , scattering , photon energy , physics , spin diffusion , magnetic field , photon , optics , ferromagnetism , quantum mechanics , thermodynamics

We perform photoinduced inverse spin-Hall effect (ISHE) measurements on a Pt/Ge(001) junction at room temperature. The spin-oriented electrons are photogenerated at the Γ point of the Ge Brillouin zone using circularly-polarized light. After the ultrafast Γ−L scattering in the Ge conduction band, which partially preserves the spin polarization, electrons diffuse into the Pt layer where spin-dependent scattering with Pt nuclei yields a transverse electromotive field EISHE. The ISHE signal dependence as a function of the incident photon energy is investigated and interpreted in the frame of a one-dimensional spin drift-diffusion model. This allows estimating the electron spin lifetime at the L-valleys to be τs=1 ns

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