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
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.
. [J]. 中国物理快报, 2017, 34(8): 87301-.
Ze-Long He, Ji-Yuan Bai, Shu-Jiang Ye, Li Li, Chun-Xia Li. Quantum Switch and Efficient Spin-Filter in a System Consisting of Multiple Three-Quantum-Dot Rings. Chin. Phys. Lett., 2017, 34(8): 87301-.
2017, Vol. 34 
