T型耦合双量子点系统的非对等Kondo共振分裂传输  

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

作　　者：谌雄文[1] 施振刚[1] 谌宝菊[1] 宋克慧[1] 

机构地区：[1]怀化学院物理与电子信息科学系

出　　处：《物理学报》2008年第4期2421-2426,共6页Acta Physica Sinica

基　　金：湖南省自然科学基金(批准号:06JJ50014);湖南省教育厅科研基金重点项目(批准号:06A055);怀化学院科学研究基金资助的课题~~

摘　　要：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.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.

关 键 词：KONDO效应 态密度 格林函数法 耦合双量子点 

分 类 号：O413.2[理学—理论物理]