Amplification of spin-filtering effect by magnetic field in GaAsN alloys

Abstract

We have found that intensity $I$ and circular polarization degree $\rho$ of the edge photoluminescence, excited in GaAsN alloys by circularly polarized light at room temperature, grow substantially in the longitudinal magnetic field $B$ of the order of 1\,kG. This increase depends on the intensity of pumping and, in the region of weak or moderate intensities, may reach a twofold value. In two-charge-state model, which considers spin-dependent recombination of spin-oriented free electrons on deep paramagnetic centers, we included the magnetic-field suppression of spin relaxation of the electrons bound on centers. The model describes qualitatively the rise of $\rho$ and $I$ in a magnetic field under different pump intensities. Experimental dependences $\rho (B)$ and $I(B)$ are shifted with respect to zero of the magnetic field by a value of $\sim$170\,Gauss, while the direction of the shift reverses with change of the sign of circular polarization of pumping. As a possible cause of the discovered shift we consider the Overhauser field, arising due to the hyperfine interaction of an electron bound on a center with nuclei of the crystal lattice in the vicinity of the center.

8 pages, 6 figures, Submitted to Physical Review B

References in corpus (3)

• Room temperature Giant Spin-dependent Photoconductivity in dilute nitride semiconductors
• Giant spin-dependent photo-conductivity in GaAsN dilute nitride semiconductor
• Optical orientation and spin-dependent recombination in GaAsN alloys under continuous-wave pumping

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• Chiral photodetector based on GaAsN
• Electron-nuclear spin dynamics of Ga${}^{2+}$ paramagnetic centers probed by spin dependent recombination: A master equation approach
• Electron-nuclear coherent spin oscillations probed by spin dependent recombination
• Spin-dependent recombination in GaAs(1-x)N(x) alloys at oblique magnetic field
• Optical spin orientation of minority holes in a modulation-doped GaAs/(Ga,Al)As quantum well
• Electron-nucleus spin correlation conservation of the spin dependent recombination in Ga${}^{2+}$ centers
• Polarization sensitive photodectector based on GaAsN
• Machine learning assisted GaAsN circular polarimeter