  We investigate the nonadiabatic dynamics of a driven spin-orbit-coupled
Bose-Einstein condensate in both weak and strong driven force. It is shown that
the standard Landau-Zener (LZ) tunneling fails in the regime of weak driven
force and/or strong spin-orbital coupling, where the full nonadiabatic dynamics
requires a new mechanism through multichannel effects. Beyond the semiclassical
approach, our numerical and analytical results show an oscillating power-law
decay in the quantum limit, different from the exponential decay in the
semiclassical limit of the LZ effect. Furthermore, the condensate density
profile is found to be dynamically fragmented by the multichannel effects and
enhanced by interaction effects. Our work therefore provides a complete picture
to understand the nonadiabatic dynamics of a spin-orbit coupled condensate,
including various range of driven force and interaction effects through
multichannel interference. The experimental indication of these nonadiabatic
dynamics is also discussed.
