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We study the pseudospin and spin dynamical effects in single-layer silicenedue to a perpendicular electric field periodically driven and its interplaywith the intrinsic and extrinsic (Rashba) spin-orbit interaction. We find thatthe spin nonconserving processes of the real spin of the quasiparticles insilicene, -- induced by the rather weak spin-orbit mechanisms --, manifestthemselves as shifts of the resonances of its quasienergy spectrum in the lowcoupling regime to the driving field. We show that there is an interestingcooperative effect among the, in principle, competing Rashba and intrinsicspin-orbit contributions. This is explicitly illustrated by exact andapproximated analytical solutions of the dynamical equations. In addition, weshow that a finite Rashba spin-orbit interaction is indeed necessary in orderto achieve a nonvanishing spin polarization. As additional feature, trivial andnontrivial topological phases might be distinguished from each other as fast orslow dynamical fluctuations of the spin polarization. We mention the possibleexperimental detection schemes of our theoretical results and their relevancein new practical implementation of periodically driven interactions in silicenephysics and related two-dimensional systems.

Spin-orbit effects on the spin and pseudospin polarization in ac-driven silicene