Resonant electronic states in disordered systems

Long-lived quasilocalized (resonant) electronic states are predicted to lie above the mobility edge of a disordered system. A modification of the optimum fluctuation method is developed to estimate the density of such states. It is shown that the density of states tails exponentially with energy above the mobility edge and that this tail is almost symmetric to the tail of localized states with respect to the mobility edge. Possible manifestations of the predicted states are discussed