Chin. Phys. Lett.  2017, Vol. 34 Issue (8): 087301    DOI: 10.1088/0256-307X/34/8/087301
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Quantum Switch and Efficient Spin-Filter in a System Consisting of Multiple Three-Quantum-Dot Rings
Ze-Long He1**, Ji-Yuan Bai2,3, Shu-Jiang Ye2, Li Li3, Chun-Xia Li1
1School of Electronic and Information Engineering, Yangtze Normal University, Chongqing 408003
2School of Electrical and Information Engineering, Heilongjiang Institute of Technology, Harbin 150050
3Key Lab of In-fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001
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Abstract 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.
Received: 02 May 2017      Published: 22 July 2017
PACS:  73.63.-b (Electronic transport in nanoscale materials and structures)  
  73.23.-b (Electronic transport in mesoscopic systems)  
  05.60.Gg (Quantum transport)  
Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11447132 and 11504042, the Natural Science Foundation of Heilongjiang Province under Grant No A201405, Chongqing Science and Technology Commission Project under Grant Nos cstc2014jcyjA00032 and cstc2016jcyjA1158, and the Scientific Research Project for Advanced Talents of Yangtze Normal University under Grant No 2017KYQD09.
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Ze-Long He, Ji-Yuan Bai, Shu-Jiang Ye et al  2017 Chin. Phys. Lett. 34 087301
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http://cpl.iphy.ac.cn/10.1088/0256-307X/34/8/087301       OR      http://cpl.iphy.ac.cn/Y2017/V34/I8/087301
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Ze-Long He
Ji-Yuan Bai
Shu-Jiang Ye
Li Li
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