CONDENSED MATTER： ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

Using the non-equilibrium Keldysh Green＇s function technique, we investigate electron transport properties of a system consisting of multiple three-quantum-dot rings. The conductance as a function of the electron energy is numerically calculated. An antiresonance point emerges in the conductance spe...

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Published in中国物理快报：英文版 Vol. 34; no. 8; pp. 121 - 124
Main Author 贺泽龙 白继元 叶树江 李立 李春霞
Format Journal Article
LanguageEnglish
Published 2017
Subjects
Green
光学性质
凝聚物质
函数方法
电子结构
电子输运性质
自旋极化
量子点
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ISSN0256-307X
1741-3540

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Summary:Using the non-equilibrium Keldysh Green＇s function technique, we investigate electron transport properties of a system consisting of multiple three-quantum-dot rings. The conductance as a function of the electron energy is numerically calculated. An antiresonance point emerges in the conductance spectra and evolves into a well-defined insulating band with the increasing number of three-quantum-dot rings. The position of the well-defined insulating band can be modulated by varying the tunneling coupling strength between adjacent three-quantum-dot rings. When an external magnetic flux is introduced, several to 100% spin-polarized windows will occur due to the Zeeman splitting. These results strongly suggest that this device may realize multiple functions including quantum switch and efficient spin filtering.
Bibliography:Using the non-equilibrium Keldysh Green＇s function technique, we investigate electron transport properties of a system consisting of multiple three-quantum-dot rings. The conductance as a function of the electron energy is numerically calculated. An antiresonance point emerges in the conductance spectra and evolves into a well-defined insulating band with the increasing number of three-quantum-dot rings. The position of the well-defined insulating band can be modulated by varying the tunneling coupling strength between adjacent three-quantum-dot rings. When an external magnetic flux is introduced, several to 100% spin-polarized windows will occur due to the Zeeman splitting. These results strongly suggest that this device may realize multiple functions including quantum switch and efficient spin filtering.
11-1959/O4
Ze-Long He1, Ji-Yuan Bai2,3, Shu-Jiang Ye2, Li Li3, Chun-Xia Li1（1.School of Electronic and Information Engineering, Yangtze Normal University, Chongqing 408003;2.School of Electrical and Information Engineering, Heilongjiang Institute of Technology, Harbin 150050;3.Key Lab of In-fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001）
ISSN:0256-307X
1741-3540