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采用Anderson模型哈密顿量和非平衡态格林函数方法对量子点环以不同构型嵌入A-B干涉器中电子输运的退耦合态及反共振现象进行了理论研究.结果表明,量子点环A-B干涉器的结构对称性以及穿过A-B干涉器的磁通量是诱发退耦合现象的两种物理机理.耦合量子点结构的对称性越高,体系在相干电子输运过程中表现出来的退耦合及反共振现象越明显.而且在具有高度对称性的耦合量子点结构中,通过磁场调节体系的结构参数可以分别使第奇数或第偶数分子本征态从电极上退耦合,从而使电子输运电导表现出奇偶对等振荡现象.这为设计纳米电子开关器件提供了一个新的物理模型.
Anderson model Hamiltonian and non-equilibrium Green’s function method are used to study the decoupling state and antiresonance of electron transport embedded in AB interferometer with different configurations of quantum dot rings. The results show that quantum dot ring AB interference The structural symmetry of the device and the magnetic flux passing through the AB interferometer are the two physical mechanisms that induce the decoupling phenomenon.The higher the symmetry of the coupled quantum dot structure, the decoupling and anti-resonance exhibited by the system during the coherent electron transport The more obvious the phenomenon.And in the highly symmetric coupling quantum dot structure, the structural parameters of the magnetic field adjustment system can make the odd or even number of molecular eigenstates decoupled from the electrode, so that the electron transport conductivity showed Odd and even pendulums.This provides a new physical model for the design of nano-electronic switching devices.