Kondo transport through a quantum dot coupled with side quantum-dot structures

doi:10.1088/1674-1056/19/7/077307

中国物理B ›› 2010, Vol. 19 ›› Issue (7): 77307-077307.doi: 10.1088/1674-1056/19/7/077307

Kondo transport through a quantum dot coupled with side quantum-dot structures

江兆潭

Department of Physics, Beijing Institute of Technology, Beijing 100081, China;Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA

修回日期:2010-01-27 出版日期:2010-07-15 发布日期:2010-07-15
基金资助:
Project supported by National Natural Science Foundation of China (Grant Nos. 10604005 and 10974015) and supported by Program for New Century Excellent Talents in University of China (Grant No. NCET-08-0044).

Kondo transport through a quantum dot coupled with side quantum-dot structures

Jiang Zhao-Tan(江兆潭)^†ger

^aDepartment of Physics, Beijing Institute of Technology, Beijing 100081, China; ^b Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA

Revised:2010-01-27 Online:2010-07-15 Published:2010-07-15
Supported by:
Project supported by National Natural Science Foundation of China (Grant Nos. 10604005 and 10974015) and supported by Program for New Century Excellent Talents in University of China (Grant No. NCET-08-0044).

摘要/Abstract

摘要： This paper investigates Kondo transport properties in a quadruple quantum dot (QD) based on the slave-boson mean field theory and the non-equilibrium Green's function. In the quadruple QD structure one Kondo-type QD sandwiched between two leads is side coupled to two separate QD structures: a single-QD atom and a double-QD molecule. It shows that the conductance valleys and peaks always appear in pairs and by tuning the energy levels in three side QDs, the one-, two-, or three-valley conductance pattern can be obtained. Furthermore, it finds that whether the valley and the peak can appear is closely dependent on the specific values of the interdot couplings and the energy level difference between the two QDs in the molecule. More interestingly, an extra novel conductance peak can be produced by the coexistence of the two different kinds of side QD structures.

Abstract: This paper investigates Kondo transport properties in a quadruple quantum dot (QD) based on the slave-boson mean field theory and the non-equilibrium Green's function. In the quadruple QD structure one Kondo-type QD sandwiched between two leads is side coupled to two separate QD structures: a single-QD atom and a double-QD molecule. It shows that the conductance valleys and peaks always appear in pairs and by tuning the energy levels in three side QDs, the one-, two-, or three-valley conductance pattern can be obtained. Furthermore, it finds that whether the valley and the peak can appear is closely dependent on the specific values of the interdot couplings and the energy level difference between the two QDs in the molecule. More interestingly, an extra novel conductance peak can be produced by the coexistence of the two different kinds of side QD structures.

Key words: quantum transport, Kondo effect, quantum dot

中图分类号: (Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))

72.10.Fk

73.21.La (Quantum dots) 73.63.Kv (Quantum dots)

江兆潭. Kondo transport through a quantum dot coupled with side quantum-dot structures[J]. 中国物理B, 2010, 19(7): 77307-077307.

Jiang Zhao-Tan(江兆潭). Kondo transport through a quantum dot coupled with side quantum-dot structures[J]. Chin. Phys. B, 2010, 19(7): 77307-077307.

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Kondo transport through a quantum dot coupled with side quantum-dot structures

Kondo transport through a quantum dot coupled with side quantum-dot structures

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