Tunneling current of the Coulomb-coupled quantum dots embedded in n-n junction

doi:10.1088/1674-1056/19/2/027302

中国物理B ›› 2010, Vol. 19 ›› Issue (2): 27302-027302.doi: 10.1088/1674-1056/19/2/027302

Tunneling current of the Coulomb-coupled quantum dots embedded in n-n junction

阎维贤¹, 赵亚平¹, 温玉兵¹, 李秀平¹, 宫建平², 许丽萍³

(1)College of Physics and Electronics, Shanxi University, Taiyuan 030006, China; (2)Department of Physics, Jinzhong University, Yuci 030600, Shanxi Province, China; (3)Department of Physics, North University of China, Taiyuan 030051, China

收稿日期:2009-04-27 修回日期:2009-06-22 出版日期:2010-02-15 发布日期:2010-02-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 60776062), the National Fundamental Fund of Personnel Training (Grant No. J0730317), and the Natural Science Foundation of Shanxi Province, China (Grant Nos. 2008011001-1 and 2008011001-2).

Tunneling current of the Coulomb-coupled quantum dots embedded in n-n junction

Yan Wei-Xian(阎维贤)^a)^†, Zhao Ya-Ping(赵亚平)^a), Wen Yu-Bing(温玉兵)^a), Li Xiu-Ping(李秀平)^a), Xu Li-Ping(许丽萍)^b), and Gong Jian-Ping(宫建平)^c)

^a College of Physics and Electronics, Shanxi University, Taiyuan 030006, China; ^b Department of Physics, North University of China, Taiyuan 030051, China; ^c Department of Physics, Jinzhong University, Yuci 030600, Shanxi Province, China

Received:2009-04-27 Revised:2009-06-22 Online:2010-02-15 Published:2010-02-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 60776062), the National Fundamental Fund of Personnel Training (Grant No. J0730317), and the Natural Science Foundation of Shanxi Province, China (Grant Nos. 2008011001-1 and 2008011001-2).

摘要/Abstract

摘要： Taking account of the electron--electron (hole) and electron--hole interactions, the tunneling processes of the main quantum dot (QD) Coulomb-coupled with a second quantum dot embedded in n--n junction have been investigated. The eighteen resonance mechanisms involved in the tunneling processes of the system have been identified. It is found that the tunneling current depends sensitively on the electron occupation number in the second quantum dot. When the electron occupation number in the second dot is tiny, both the tunneling current peaks and the occupation number plateaus in the main QD are determined by the intra-resonance mechanism. The increase of the electron occupation number in the second dot makes the inter-resonance mechanism participate in the transport processes. The competition between the inter and intra resonance mechanisms persists until the electron occupation number in the second dot reaches around unity, leading to the consequence that the inter-resonance mechanisms completely dominate the tunneling processes.

Abstract: Taking account of the electron--electron (hole) and electron--hole interactions, the tunneling processes of the main quantum dot (QD) Coulomb-coupled with a second quantum dot embedded in n--n junction have been investigated. The eighteen resonance mechanisms involved in the tunneling processes of the system have been identified. It is found that the tunneling current depends sensitively on the electron occupation number in the second quantum dot. When the electron occupation number in the second dot is tiny, both the tunneling current peaks and the occupation number plateaus in the main QD are determined by the intra-resonance mechanism. The increase of the electron occupation number in the second dot makes the inter-resonance mechanism participate in the transport processes. The competition between the inter and intra resonance mechanisms persists until the electron occupation number in the second dot reaches around unity, leading to the consequence that the inter-resonance mechanisms completely dominate the tunneling processes.

Key words: single-electron tunneling, exciton complexes, quantum dots

中图分类号: (Quantum dots)

73.63.Kv

73.40.Gk (Tunneling) 71.35.-y (Excitons and related phenomena) 73.21.La (Quantum dots) 73.23.Hk (Coulomb blockade; single-electron tunneling)

阎维贤, 赵亚平, 温玉兵, 李秀平, 许丽萍, 宫建平. Tunneling current of the Coulomb-coupled quantum dots embedded in n-n junction[J]. 中国物理B, 2010, 19(2): 27302-027302.

Yan Wei-Xian(阎维贤), Zhao Ya-Ping(赵亚平), Wen Yu-Bing(温玉兵), Li Xiu-Ping(李秀平), Xu Li-Ping(许丽萍), and Gong Jian-Ping(宫建平). Tunneling current of the Coulomb-coupled quantum dots embedded in n-n junction[J]. Chin. Phys. B, 2010, 19(2): 27302-027302.

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Tunneling current of the Coulomb-coupled quantum dots embedded in n-n junction

Tunneling current of the Coulomb-coupled quantum dots embedded in n-n junction

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