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Persistent, oscillatory charge and spin currents are shown to be driven by atwo-component terahertz laser pulse in a one-dimensional mesoscopic ring withRashba-Dresselhaus spin orbit interactions (SOI) linear in the electronmomentum. The characteristic interference effects result from the oppositeprecession directions imposed on the electron spin by the two SOI couplings.The time dependence of the currents is obtained by solving numerically theequation of motion for the density operator, which is later employed incalculating statistical averages of quantum operators on few electroneigenstates. The parameterization of the problem is done in terms of the SOIcoupling constants and of the phase difference between the two lasercomponents. Our results indicate that the amplitude of the oscillations iscontrolled by the relative strength of the two SOI's, while their frequency isdetermined by the difference between the excitation energies of the electronstates. Furthermore, the oscillations of the spin current acquire a beatingpattern of higher frequency that we associate with the nutation of the electronspin between the quantization axes of the two SOI couplings. This phenomenondisappears at equal SOI strengths, whereby the opposite precessions occur withthe same probability.

Persistent charge and spin currents in a 1D ring with Rashba and Dresselhaus spin-orbit interactions by excitation with a terahertz pulse