Quantum Switch and Efficient Spin-Filter in a System Consisting of Multiple Three-Quantum-Dot Rings
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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.
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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[J]. Chin. Phys. Lett., 2017, 34(8): 087301. DOI: 10.1088/0256-307X/34/8/087301
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[J]. Chin. Phys. Lett., 2017, 34(8): 087301. DOI: 10.1088/0256-307X/34/8/087301
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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[J]. Chin. Phys. Lett., 2017, 34(8): 087301. DOI: 10.1088/0256-307X/34/8/087301
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[J]. Chin. Phys. Lett., 2017, 34(8): 087301. DOI: 10.1088/0256-307X/34/8/087301
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