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We present a detailed analysis of the spin-flip excitations induced by aperiodic time-dependent electric field in the Rashba prototype Au(111) noblemetal surface. Our calculations incorporate the full spinor structure of thespin-polarized surface states and employ a Wannier-based scheme for thespin-flip matrix elements. We find that the spin-flip excitations associatedwith the surface states exhibit an important angular modulation which iscompletely absent in the standard Rashba model \cite{rashba}. Furthermore, wedemonstrate that the maximum of the calculated spin-flip absorption rate isabout twice the model prediction. These results show that although the Rashbamodel accurately describes the spectrum and spin polarization, it does notfully account for the dynamical properties of the surface states.

Spin-flip transitions and departure from the Rashba model in the Au(111) surface