Spin relaxation in an InAs quantum dot in the presence of terahertz driving fields

The spin relaxation in a one-dimensional InAs quantum dot with the Rashba spin-orbit coupling under driving THz magnetic fields is investigated by developing a kinetic equation with the help of the Floquet-Markov theory, which is generalized to the system with the spin-orbit coupling, to include both the strong driving field and the electron-phonon scattering. The spin relaxation time can be effectively prolonged or shortened by the terahertz magnetic field depending on the frequency and strength of the terahertz magnetic field. The effect can be understood as the sideband-modulated spin-phonon interaction. This offers an additional way to manipulate the spin relaxation time.