Influence of transverse interdot coupling on electron transport properties in a double-quantum-dot Aharonov-Bohm structure

By means of modified rate equations we investigate the influence of the transverse interdot coupling on the Aharonov-Bohm CAB) structure, which is composed of two coupled quantum dots (QDs) sandwiched between source and drain. The numerical results show that the interdot coupling between the two QDs can cause a temporal oscillation in electron-occupation at the initial stage of the quantum dynamics, while the source-drain current decays monotonically to a stationary value. On the other hand, the interdot coupling divides the AB ring into two coupled subrings. That destroys the normal AB oscillation and generates a new and complex periodic oscillation with its period related to the magnetic flux ratio.