  In this article we study the spin and tunneling dynamics as a function of
magnetic field in a one-dimensional GaAs double quantum dot with both the
Dresselhaus and Rashba spin-orbit coupling. In particular we consider different
spatial widths for the spin-up and spin-down electronic states. We find that
the spin dynamics is a superposition of slow as well as fast Rabi oscillations.
It is found that the Rashba interaction strength as well as the external
magnetic field strongly modifies the slow Rabi oscillations which is
particularly useful for single qubit manipulation for possible quantum computer
applications.
