Time-dependent transport through a quantum dot with the over-dot (bridge) additional tunneling channel

The time-dependent, electron transport through a quantum dot with the additional over-dot (bridge) tunneling channel within the evolution operator technique has been studied. The microwave,field applied to the leads and quantum dot has been considered and influence, of the time-dependent shift of corresponding energy, levels on the quantum dot charge and current flowing, in the system, its time-averaged values and derivatives of the average current with respect to the gate and source-drain bias voltages have been investigated. The influence of the over-dot tunneling channel on the photon-assisted tunneling has been also studied. (C) 2003 Elsevier Science B.V. All rights reserved.