Crossover from diffusive to non-diffusive dynamics in the two-dimensional electron gas with Rashba spin-orbit coupling

摘要

We present the calculation of the density matrix response function of thetwo-dimensional electron gas with Rashba spin-orbit interaction, which isapplicable in a wide range of parameters covering the diffusive andnon-diffusive, the dirty and the clean limits. A description of the crossoverbetween the different regimes is thus provided as well. On the basis of thederived microscopic expressions we study the propagating charge andspin-polarization modes in the clean, non-diffusive regime, which is accessiblein the modern experiments.