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Quantum Switch and Efficient Spin-Filter in a System Consisting of Multiple Three-Quantum-Dot Rings.

Authors :
Ze-Long He
Ji-Yuan Bai
Shu-Jiang Ye
Li Li
Chun-Xia Li
Source :
Chinese Physics Letters; Aug2017, Vol. 34 Issue 8, p1-1, 1p
Publication Year :
2017

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0256307X
Volume :
34
Issue :
8
Database :
Complementary Index
Journal :
Chinese Physics Letters
Publication Type :
Academic Journal
Accession number :
124496655
Full Text :
https://doi.org/10.1088/0256-307X/34/8/087301