Spin-dependent recombination and hyperfine interaction at the deep defects

Abstract

We present a theoretical study of optical electron-spin orientation and spin-dependent Shockley-Read-Hall recombination taking into account the hyperfine coupling between the bound-electron spin and the nuclear spin of a deep paramagnetic center. We show that the number of master rate equations for the components of the electron-nuclear spin-density matrix is considerably reduced due to the restrictions imposed by the axial symmetry of the system under consideration. The rate equations describe the Zeeman splitting of the electron spin sublevels in the longitudinal magnetic field, the spin relaxation of free and bound electrons, and the nuclear spin relaxation in the two defect states, with one and two (singlet) bound electrons. The general theory is developed for an arbitrary value of the nuclear spin I, the magnetic-field and excitation-power dependencies of the electron and nuclear spin polarizations are calculated for the particular value of I = 1/2. The role of the nuclear spin relaxation in each of the both defect states is analyzed. The circular polarization and intensity of the edge photoluminescence as well as the dynamic nuclear spin polarization as functions of the excitation power are shown to have bell-shaped forms

22 pages, 5 figures, revised the title of the bottom axis in Fig.5, corrected typos; results unchanged

References in corpus (9)

• 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
• Amplification of spin-filtering effect by magnetic field in GaAsN alloys
• Giant spin-dependent photo-conductivity in GaAsN dilute nitride semiconductor
• Optical orientation and spin-dependent recombination in GaAsN alloys under continuous-wave pumping
• Room temperature optical manipulation of nuclear spin polarization in GaAsN
• Fabrication of an InGaAs spin filter by implantation of paramagnetic centers
• Optical orientation of nuclei in nitrogen alloys GaAsN at room temperature

Cited by in corpus (8)

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• Electron-nuclear spin dynamics of Ga${}^{2+}$ paramagnetic centers probed by spin dependent recombination: A master equation approach
• Spin-dependent recombination in GaAs(1-x)N(x) alloys at oblique magnetic field
• Polarization sensitive photodectector based on GaAsN
• Electron-nucleus spin correlation conservation of the spin dependent recombination in Ga${}^{2+}$ centers
• Machine learning assisted GaAsN circular polarimeter