Spin manipulation in a pulse-pumped double quantum dot with spin-orbit coupling

Dynamical processes in semiconductor quantum dots are of great interest due to the variety of physical phenomena and possible applications. When the spin-orbit coupling (SOC) is present, even simple systems such as single-electron quantum dots show a rich dynamics in the coupled charge and spin channels. This coupling is in the core of the proposal for a new technique to manipulate the spins in quantum dots by electric field [1,2]. We consider the full dynamics of an electron in a one-dimensional double quantum dot with SOC pumped by an external electric field. Here the tunneling between single quantum dots plays the crucial role in the low-energy states, and both the electron states and the tunneling are spin-dependent. The interplay of the irregular dynamics for spin and charge degrees of freedom is important for the entire system, demonstrating the abilities of a coherent spin manipulation. [1] E. I. Rashba and Al. L. Efros , Phys. Rev. Lett. \textbf{91}, 126405 (2003) [2] K.C. Nowack et al., Science \textbf{318}, 1430 (2007)