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

• 来源期刊: 中国物理快报（英文版）
• 关键词: @@
• 年，卷（期）: 2017,（8）
• 页码范围: 121-124
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/34/8/087301

摘要

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 welldefined 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-quantumdot 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.