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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λ与线宽函数Γ对系统的输运行为有较大影响.当λ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Γ增大时,在Andreev反射共振峰的两侧将出现新的边峰.
The mesoscopic transport of a normal metal-molecular quantum dot-superconducting coupling system (N-MQD-S) is studied by using the non-equilibrium Green’s function theory, the canonical transformation and the BCS mean field theory. The current formula of the system is obtained and the appropriate The numerical results show that the coupling strength λ and the linewidth function Γ have a great influence on the transport behavior of the system.When λ increases, the resonance peak generated by phonon-assisted tunneling Will be higher than that of the molecular quantum dot itself; when the linewidth function Γ increases, new side peaks will appear on both sides of the Andreev reflection resonance peak.