Abstract
We investigate the feasibility of compensating the bulk inversion asymmetry in a [111]-oriented quantum well with the Rashba structure inversion asymmetry that has precisely the same functional form. The resulting cancellation is found to provide a promising means for strongly suppressing the spin-relaxation rate associated with the D’yakonov–Perel’ (DP) mechanism. We discuss a detailed numerical study of the spin splitting in a suitable InAlAs∕InGaAs∕InP quantum well grown on a [111] InP substrate, for which an external electric field is used to fine tune the asymmetry. We show that the DP spin-relaxation rate can be suppressed by nearly an order of magnitude at room temperature and by a factor of 2000 at 10K.
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