T型耦合双量子点系统的非对等Kondo共振分裂传输

利用隶玻色子平均场近似理论，并借助于单杂质的Anderson模型的哈密顿量，研究了T型耦合双量子点嵌入正常电极的基态输运性质.结果表明：在体系处于平衡状态时，随着双量子点的耦合强度增加，体系的Kondo 效应被削弱. 当耦合强度足够强时，Kondo量子点态密度的Kondo共振单峰分裂成两个不对等的Kondo共振双峰.在体系处于非平衡状态时，增加两电极的偏压,态密度的Kondo分裂的非对等性明显加强. 关键词： Kondo效应 态密度 格林函数法 耦合双量子点

Asymmetric Kondo resonance splitting transition in T-shaped coupled-quantum-dot devices

Using the slave-boson mean-field approximation, we theoretically study the transport properties of the ground state of the T-shaped coupled quantum dots with two metallic leads by means of one-impurity Anderson Hamiltonian. It is found that when this system is in the equilibrium state, with the increase of the inter-dot coupling, the Kondo resonance is suppressed, and the single Kondo peak of the density of the Kondo quantum dot is split into two asymmetric Kondo peaks. When it is in the non-equilibrium state, when increasing the bias, this asymmetric Kondo splitting is enhanced.