Electron Transport Properties through a Two-Dimensional Quantum Dot Array

Abstract Electron transport characteristics through a two-dimensional quantum dot array are studied using the non-equilibrium Green’s function. As the structure size of the two-dimensional quantum dot array changes, abundant meaningful electron transport properties are obtained. For a two-dimensional four-quantum-dot structure, an antiresonance point gradually evolves into an antiresonance band with the increase of the dot-lead coupling strength. An antiresonance band emerges in the conductance spectrum as the energy levels of quantum dots in upper and lower quantum dot arrays are different and small. In contrast, the antiresonance band evolves into a resonance band as the difference between the energy levels of quantum dots is large. Based on this property, the system can be designed as an efficient quantum switch. Moreover, typical Fano resonances may be observed in the two-dimensional quantum dot array. It is expected that these findings will contribute to the design of quantum devices.