Numerical simulation of inverse spin Hall spectra in Pt/GaAs hybrid structure

The inverse spin Hall spectra in Pt/GaAs hybrid structure in the range 1-3 eV photon energy are estimated using numerical calculations. The numerical model used here takes account of both energy and spin relaxation phenomena for optically induced hot electrons, tunnelling and thermionic transport effects at Pt/GaAs interface and circular dichroism for the light transmitted through the Pt layer. The optically excited electrons in GaAs induces a spin current in the Pt layer after crossing the Schottky barrier that leads to transverse electrical voltage due to large spin-orbit coupling in Pt. The magnitude and polarity of this voltage depend on photon energy, angle of incidence of light, and barrier height. It is found that the magnitude of this voltage is maximum for 600 angle of incidence irrespective of photon energy and barrier height.