The transparency of a double barrier in a time-dependent external field

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Abstract
The effect of the shift of the instantaneous position of the energy level by an external time-dependent field is investigated in the case of resonant tunnelling through a double-barrier potential. It is shown that, in the non-adiabatic case, if the amplitude of the field is large compared with its frequency, the level can capture particles from the incident wave at the times when its position coincides with the energy of the incident flux. The subsequent decay of the quasi-stationary state in the well gives rise to the tunnelling current. This process leads to the formation of the two peaks in the resonance characteristics of the tunnelling system.