二维十字型四终端量子点阵列的量子输运

Quantum transport through two-dimensional cross-shaped quantum dot array of four-terminal system

介观体系的电子输运为设计纳米尺度的纳米结构电子装置提供了理论依据。基于先前研究提出的传输矩阵方法,计算了十字型四终端量子点阵列体系模型的透射系数,并将该四终端体系模型转化成二终端模型,研究了相对于中间原点处非对称和对称的十字型量子点阵列体系的电子输运。结果表明:空间反转对称的十字型量子点阵列的透射率尖峰个数与量子点阵列上的量子点数相等,透射系数与入射电子能量、量子点宽度和量子点数有关,而与跃迁积分无关。

The electron transport in mesoscopic system provides a theoretical basis for the design of electronic devices with nanoscale nanostructures. Based on the transmission matrix method proposed in the previous research, the transmission coefficient of the cross-shaped four terminal quantum dot matrix system is calculated, and then the four terminal quantum dot array system model is transformed into a two terminal model to study the electronic transport of the asymmetric and symmetric cross quantum dot array system relative to the intermediate origin. The results show that the number of transmission peaks of the cross quantum dot array with space reversal symmetry is equal to the number of quantum dots on the quantum dot array, and the transmission coefficient depends on the incident electron energy, the quantum dot width and the quantum number, but not on the transition integral.