  We analyzed theoretically localized charge relaxation in a double quantum dot
(QD) system coupled with continuous spectrum states in the presence of
localized electrons Coulomb interaction in a single QD. We have found that for
a wide range of system parameters charge relaxation occurs through two stable
regimes with significantly different relaxation rates. A peculiar time moment
exists in the system at which rapid switching between stable regimes takes
place. We consider this phenomenon to be applicable for creation of active
elements in nano-electronics based on the fast transition effect between two
stable states.
