Journal
PHYSICAL REVIEW B
Volume 106, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.125202
Keywords
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy EXC-2123 QuantumFrontiers [390837967, 315579172, OE 177/10-2]
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We present a detailed study of the temperature-dependent electron spin relaxation rate in n-type bulk GaAs and observe the longest spin relaxation time slightly below the metal-to-insulator transition at a finite temperature. This phenomenon results from the delicate interplay of hyperfine interaction, variable range hopping, and the Dyakonov-Perel mechanism.
We present a detailed study of the temperature-dependent electron spin relaxation rate in n-type bulk GaAs in the regime of the metal-to-insulator transition at vanishing magnetic fields. The high-accuracy measurements reveal the longest spin relaxation time for a doping concentration slightly below the metal-to-insulator transition at a finite temperature of similar to 7 K. This global minimum of the electron spin relaxation rate results from a delicate interplay of hyperfine interaction, variable range hopping, and the Dyakonov-Perel mechanism. At higher doping densities, the Dyakonov-Perel mechanism becomes dominant at all temperatures changing with temperature gradually from the degenerate to the nondegenerate regime. A theoretical model including temperature-dependent transport data yields not only quantitative agreement with the experimental data but reveals additionally the gradual change from percolation-based large angle momentum scattering to ionized impurity small angle scattering. A simple interpolation of all available data allows to extract a maximal-possible spin relaxation time in n-doped, bulk GaAs for negligible external magnetic fields of approximate to 1 mu s.
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