Influences of a Side-Coupled Triple Quantum Dot on Kondo Transport Through a Quantum Dot  

作　　者：江兆潭 杨彦楠 秦志杰 

机构地区：[1]Department of Physics,Beijing Institute of Technology [2]State Key Laboratory of Artificial Microstructure and Mesoscopic Physics,School of Physics,Peking University [3]College of Physical Engineering,Zhengzhou University

出　　处：《Communications in Theoretical Physics》2010年第11期925-932,共8页理论物理通讯（英文版）

基　　金：Supported by the National Nature Science Foundation of China under Grant Nos.10604005 and 10974015; the Program for New Century Excellent Talents in University under Grant No.NCET-08-0044

摘　　要：Kondo transport properties through a Kondo-type quantum dot （QD） with a side-coupled triple-QD structure are systematically investigated by using the non-equilibrium Green＇s function method. We firstly derive the formulae of the current, the linear conductance, the transmission coefficient, and the local density of states. Then we carry out the analytical and numerical studies and some universal conductance properties are obtained. It is shown that the number of the conductance valleys is intrinsically determined by the side-coupled QDs and at most equal to the number of the QDs included in the side-coupled structure in the asymmetric limit. In the process of forming the conductance valleys, the side-coupled QD system plays the dominant role while the couplings between the Kondo-type QD and the side-coupled structure play the subsidiary and indispensable roles. To testify the validity of the universal conductance properties, another different kinds of side-coupled triple-QD structures are considered. It should be emphasized that these universal properties axe applicable in understanding this kind of systems with arbitrary many-QD side structures.

关 键 词：Kondo effect quantum dots 

分 类 号：O471.1[理学—半导体物理]