Effect of the Pauli principle on photoelectron spin transport in p+ GaAs

F. Cadiz; D. Paget; A. C. H. Rowe; L. Martinelli; S. Arscott

doi:10.1117/12.2188080

8 September 2015 Effect of the Pauli principle on photoelectron spin transport in _p+ GaAs

F. Cadiz, D. Paget, A. C. H. Rowe, L. Martinelli, S. Arscott

Proceedings Volume 9551, Spintronics VIII; 955125 (2015) https://doi.org/10.1117/12.2188080
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

In _p+ GaAs thin films, under excitation by a tightly-focused laser, the spatial profile of the spin polarization is monitored as a function of excitation power. It is found that photoelectron diffusion depends on spin, as a direct consequence of the Pauli principle which causes a concentration dependence of the spin stiffness. Thermoelectric currents are also predicted to depend on spin under degeneracy (spin Soret currents), but these currents play a relatively small role in this case. The spin dependence of the mobility is also found weak. Conversely, ambipolar coupling with holes increases the steady-state photo-electron density at the place of excitation and therefore the amplitude of the degeneracy-induced polarization decrease at the place of excitation.

Citation Download Citation

F. Cadiz, D. Paget, A. C. H. Rowe, L. Martinelli, and S. Arscott "Effect of the Pauli principle on photoelectron spin transport in _p+ GaAs", Proc. SPIE 9551, Spintronics VIII, 955125 (8 September 2015); https://doi.org/10.1117/12.2188080

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