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Low-temperature spin relaxation in n -type GaAs

by: R. I. Dzhioev, K. V. Kavokin, V. L. Korenev, M. V. Lazarev, Ya, M. N. Stepanova, B. P. Zakharchenya, D. Gammon, D. S. Katzer
Physical Review B, Vol. 66 (Dec 2002), 245204, doi:10.1103/physrevb.66.245204  Key: citeulike:9906677

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Abstract

Low-temperature electron-spin relaxation is studied by the optical orientation method in bulk n-GaAs with donor concentrations from 1014cm-3 to 5×1017cm-3. A peculiarity related to the metal-to-insulator transition is observed in the dependence of the spin lifetime on doping near nD=2×1016cm-3. In the metallic phase, spin relaxation is governed by the Dyakonov-Perel mechanism, while in the insulator phase it is due to anisotropic exchange interaction and hyperfine interaction


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