Transport properties of a coupled double-bridged quantum dot arrays model in an ac electric and a magnetic fields

摘要

We have studied the transport properties of an ac driving double-bridged quantum dot arrays coupled to electronic leads with a uniform magnetic field applied perpendicularly on it using the method based on Floquet approach. The average current as a function of the driving frequency Q with different parameters of the system can be obtained by numerically solving the corresponding Floquet equation of the system. We have found that the coupling between the two energy levels of the quantum dots on the same bridge site can cause the current peaks degenerate but the magnetic field can eliminate this degeneracy. Thus it is possible for us to manipulate the position and the number of the resonance current peaks in the coupled double-bridged model by varying some of the parameter of the system. (c) 2006 Elsevier B.V. All rights reserved.