Electron transport through two one-dimensional multi-quantum dot arrays coupled to four leads

摘要

Employing the non-equilibrium Green's function technique, we have obtained the formula for dc current of two one-dimensional multi-quantum dot arrays, which couple to each other via tunneling coupling between two quantum dots connected to four leads, respectively. The retarded Green's function is a staircase type, terminating at the four leads. Furthermore, the four quantum dots case is demonstrated. The influence of interdot coupling strength and quantum dot energy level on the transmission probability for TL, TM and TN branches is investigated. A non-resonant band is observed. By adjusting energy levels of quantum dots, a resonance emerges in the region of the non-resonance band. The system can be used as a quantum switch.