正常金属-分子量子点-超导耦合系统的介观输运研究

运用非平衡格林函数理论、正则变换以及BCS平均场理论研究了正常金属-分子量子点-超导耦合系统（N-MQD-S）的介观输运，得到了系统的电流公式并选择适当的参数进行了数值计算。数值计算结果表明：电声子耦合强度 与线宽函数 对系统的输运行为有较大影响。当 增大时，由声子辅助隧穿所产生的共振峰将高于分子量子点自身能级产生的共振峰；当线宽函数 增大时，在Andreev反射共振峰的两侧将出现新的边峰。

Mesoscopic transport through a hybrid system with a single molecular dot coupled to normal and superconducting leads

We have investigated the mesoscopic transport through the normal metal-molecule quantum dot-superconductor (N-MQD-S )system by using nonequilibrium Green's function and canonical transformation of the electron-phonon interaction.We employ theory to describe the Hamiltonian of the superconducting lead.The coupling strength of electron-phonon interaction ( EPI) has huge influence on the current.As the increases,the peak caused by the phonon-assisted transport is higher than the main peak.This is different from system.We also find that the linewidth function affect the transport properties of the system.As the increases,side peaks emerge around the peak caused by Andreev reflection.