Figure 1

Schematics of the conventional D’yakonov-Perel’ spin-relaxation mechanism (a): the electron spin precesses around the SOC fields and scatter on a τ timescale. Each scattering results in a new random \(\underline{k}\) value and a different vector of the SOC field. (b) In the absence of momentum scattering, i.e. the clean limit, the dynamic spin-susceptibility, χ(ω), is given by the distribution of the SOC fields. The quasi-particle spectral function, A _Γ, has a width of 2Γ/ħ and the finite momentum lifetime gives rise to the “dirty” case. We show Imχ(ω)/ω for clarity as Imχ(ω) is an odd function.