Nonadiabatic generation of a pure spin current in a one-dimensional quantum ring with spin-orbit interaction

作者：Nita Marian^*; Marinescu D C; Manolescu Andrei; Gudmundsson Vidar

来源：Physical Review B, 2011, 83(15): 155427.

DOI：10.1103/PhysRevB.83.155427

We demonstrate the theoretical possibility of obtaining a pure spin current in a 1D ring with spin-orbit interaction by irradiation with a nonadiabatic, two-component terahertz laser pulse, whose spatial asymmetry is reflected by an internal phase difference phi. The solutions of the equation of motion for the density operator are obtained for a spin-orbit coupling linear in the electron momentum (Rashba) and they are used to calculate the time-dependent charge and spin currents. We find that there are critical values of phi at which the charge current disappears, while the spin current reaches a maximum or a minimum value.

• 出版日期2011-4-18