Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-02-23
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 2 figures, submitted to Phys. Rev. Lett
Scientific paper
We identify the Dresselhaus spin-orbit coupling as the source of the dominant spin-relaxation mechanism in the impurity band of doped semiconductors. The Dresselhaus-type (i.e. allowed by bulk-inversion asymmetry) hopping terms are derived and incorporated into a tight-binding model of impurity sites, and they are shown to unexpectedly dominate the spin relaxation, leading to spin-relaxation times in good agreement with experimental values. This conclusion is drawn from two complementary approaches employed to extract the spin-relaxation time from the effective Hamiltonian: an analytical diffusive-evolution calculation and a numerical finite-size scaling.
Intronati Guido A.
Jalabert Rodolfo A.
Tamborenea Pablo I.
Weinmann Dietmar
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