Giant spin-dependent photo-conductivity in GaAsN dilute nitride semiconductor

Abstract

A theoretical and experimental study of the spin-dependent photoconductivity in dilute Nitride GaAsN is presented. The non linear transport model we develop here is based on the rate equations for electrons, holes, deep paramagnetic and non paramagnetic centers both under CW and pulsed optical excitation. Emphasis is given to the effect of the competition between paramagnetic centers and non paramagnetic centers which allows us to reproduce the measured characteristics of the spin-dependent recombination power dependence. Particular attention is paid to the role of an external magnetic field in Voigt geometry. The photoconductivity exhibits a Hanle-type curve whereas the spin polarization of electrons shows two superimposed Lorentzian curves with different widths, respectively related to the recombination of free and trapped electrons. The model is capable of reproducing qualitatively and quantitatively the most important features of photoluminescence and photocurrent experiments and is helpful in providing insight on the various mechanisms involved in the electron spin polarization and filtering in GaAsN semiconductors.

arXiv comment10 pages, 5 figures

References in corpus (5)

• Magnetoresistance due to edge spin accumulation
• Spin-dependent recombination in GaAsN alloys
• Spin-dependent electron dynamics and recombination in GaAs(1-x)N(x) alloys at room temperature
• Room temperature Giant Spin-dependent Photoconductivity in dilute nitride semiconductors
• Optical orientation and spin-dependent recombination in GaAsN alloys under continuous-wave pumping

Cited by in corpus (12)

• Amplification of spin-filtering effect by magnetic field in GaAsN alloys
• Room temperature optical manipulation of nuclear spin polarization in GaAsN
• Spin-dependent recombination and hyperfine interaction at the deep defects
• Fabrication of an InGaAs spin filter by implantation of paramagnetic centers
• 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
• 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
• A systematic study of spin-dependent recombination in GaAs${}_{1-x}$N${}_x$ as a function of nitrogen content
• Deep-level structure of the spin-active recombination center in dilute nitrides