The process of aggregation of charged particles generated by the external source and subsequent kinetics of their recombination after switching off an external source (reaction A+B→0) was studied. It was shown that the three-dimensional Coulomb interaction suppresses the aggregation of...

We consider a single spin in a constant magnetic field or an anisotropy field. We show that additional external time-periodic fields with zero mean may generate nonzero time-averaged spin components which vanish for the time-averaged Hamiltonian. The reason is a lowering of the dynamical...