Abstract
Ultrafast light-induced insulator-metal phase transitions (IM PT) in VO2 thin films was studied with use of a pump-probe technique. These studies show that the IM PT could be realized via an intermediate state. The relaxation processes after optical pumping are dependent on pump energy. The excitonic controlled model for such type of IM PT is proposed on this basis. The main channel for the ultrafast light-induced IM PT is the resonant transition between excited states of correlated vibronic Wannier-Mott excitons (WME) in insulator phase and the unoccupied excited states in metallic phase. The experiment observation, such as pump power drastic dependences of relaxation could be interpreted in the framework of the model.
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