1212.6620 (V. V. Pavlov et al.)

Amplification of the photocurrent in SiO2(Co)/GaAs heterostructure
induced by magnetic field in the avalanche regime    [PDF]

V. V. Pavlov, L. V. Lutsev, P. A. Usachev, A. A. Astretsov, A. I. Stognij, N. N. Novitskii, R. V. Pisarev

Amplification of the photocurrent in heterostructures of silicon dioxide films containing cobalt nanoparticles grown on gallium arsenide SiO2(Co)/GaAs has been observed in magnetic field in the avalanche regime. While the avalanche process is suppressed by the magnetic field and the current decreases, for photon energy E greater than the GaAs bandgap energy the photocurrent significantly increases. The amplification reaches 9.5 for E = 1.50 eV. The effect of the photocurrent amplification is explained by the spin-dependent recombination process at deep impurity centers in GaAs.

View original: http://arxiv.org/abs/1212.6620