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The experimental values given in this Rapid Communication correspond to the most symmetric measured spin noise peaks and, hence, to the longest measured spin lifetimes since some traces show an asymmetric behavior from unknown origin. However, no systematic dependence on the angle between sample surface or magnetic field direction can be reported.
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-
At moderate fields, a physical correct fit function would base upon Voigt profiles which have too many free parameters for practical purposes. Nevertheless, fitting with Gaussian profiles yields very similar peak widths as fitting Lorentzian profiles. At small magnetic fields and temperatures below 50 K, the temperature dependence of Γ s scales with the temperature dependence of the conductivity (Ref.) suggesting a spin dephasing mechanism that depends on motional narrowing and should therefore be less efficient at higher B (Ref.).
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In our simple model, we have to assume a width of the depletion zone of some ten microns in order to mimic the measured results. A more sophisticated model would probably yield a different width. Nevertheless, we are not aware of any theoretical description of depletion zones at the MIT. Additionally, spin diffusion and electron hopping also lead to smoothing of the measured g -factor profile which is not accounted for in our modeling.
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