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EnglishNon-equilibrium electron spin relaxation in a n-type doped GaAs bulk semiconductor is investigated. We use a semiclassical Monte Carlo approach by considering multivalley spin dynamics of drifting electrons. Spin relaxation is considered through the D'yakonov-Perel mechanism, which is the dominant process in III-V semiconductors. An analytical expression for the inhomogeneous broadening of spin precession vector is derived by taking into account the effect of the electric field and the doping density. The inclusion of electron-electron scattering has the effect of increasing both the spin lifetime and the depolarization length. In particular, we find a non-monotonic trend with the maximum of both the spin lifetime and the depolarization length, as a function of the lattice temperature. This peculiar behavior, which is due to the nonlinear spin-lattice interaction through the phononic thermal bath, is akin to the noise-enhanced stability phenomenon. Moreover, for lattice temperatures up to 77 K the electron spin lifetime slightly increases with the doping density, while the spin depolarization length shows a decreasing behaviour. For electic field amplitudes higher than the threshold field (Gunn field), the spin lifetime increases with the lattice temperature. Our numerical findings are validated by a good agreement with the available experimental results.
D. Persano Adorno, S. Spezia, N. Pizzolato, & B. Spagnolo (2019). Nonequilibrium electron spin relaxation in n-type doped GaAs sample. JOURNAL OF STATISTICAL MECHANICS: THEORY AND EXPERIMENT, 094019-1-094019-22 [10.1088/1742-5468/ab3411].
| Data di pubblicazione: | 2019 | |
| Titolo: | Nonequilibrium electron spin relaxation in n-type doped GaAs sample | |
| Autori: | ||
| Citazione: | D. Persano Adorno, S. Spezia, N. Pizzolato, & B. Spagnolo (2019). Nonequilibrium electron spin relaxation in n-type doped GaAs sample. JOURNAL OF STATISTICAL MECHANICS: THEORY AND EXPERIMENT, 094019-1-094019-22 [10.1088/1742-5468/ab3411]. | |
| Rivista: | ||
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1088/1742-5468/ab3411 | |
| Abstract: | Non-equilibrium electron spin relaxation in a n-type doped GaAs bulk semiconductor is investigated. We use a semiclassical Monte Carlo approach by considering multivalley spin dynamics of drifting electrons. Spin relaxation is considered through the D'yakonov-Perel mechanism, which is the dominant process in III-V semiconductors. An analytical expression for the inhomogeneous broadening of spin precession vector is derived by taking into account the effect of the electric field and the doping density. The inclusion of electron-electron scattering has the effect of increasing both the spin lifetime and the depolarization length. In particular, we find a non-monotonic trend with the maximum of both the spin lifetime and the depolarization length, as a function of the lattice temperature. This peculiar behavior, which is due to the nonlinear spin-lattice interaction through the phononic thermal bath, is akin to the noise-enhanced stability phenomenon. Moreover, for lattice temperatures up to 77 K the electron spin lifetime slightly increases with the doping density, while the spin depolarization length shows a decreasing behaviour. For electic field amplitudes higher than the threshold field (Gunn field), the spin lifetime increases with the lattice temperature. Our numerical findings are validated by a good agreement with the available experimental results. | |
| Settore Scientifico Disciplinare: | Settore FIS/03 - Fisica Della Materia Settore FIS/02 - Fisica Teorica, Modelli E Metodi Matematici | |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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http://hdl.handle.net/10447/376080
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