Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-01-29
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Extended derivations and info, fixed typos and refs, updated figs and data. Worth a re-download
Scientific paper
10.1103/PhysRevB.71.075315
Silicon is a leading candidate material for spin-based devices, and two-dimensional electron gases (2DEGs) formed in silicon heterostructures have been proposed for both spin transport and quantum dot quantum computing applications. The key parameter for these applications is the spin relaxation time. Here we apply the theory of D'yakonov and Perel' (DP) to calculate the electron spin resonance linewidth of a silicon 2DEG due to structural inversion asymmetry for arbitrary static magnetic field direction at low temperatures. We estimate the Rashba spin-orbit coupling coefficient in silicon quantum wells and find the $T_{1}$ and $T_{2}$ times of the spins from this mechanism as a function of momentum scattering time, magnetic field, and device-specific parameters. We obtain agreement with existing data for the angular dependence of the relaxation times and show that the magnitudes are consistent with the DP mechanism. We suggest how to increase the relaxation times by appropriate device design.
Joynt Robert
Tahan Charles
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