中国物理B ›› 2013, Vol. 22 ›› Issue (4): 47302-047302.doi: 10.1088/1674-1056/22/4/047302
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
吴丽君a, 韩宇b
Wu Li-Jun (吴丽君)a, Han Yu (韩宇)b
摘要: The spin-polarized linear conductance spectrum and current-voltage characteristics in a four-quantum-dot ring embodied into Aharonov-Bohm (AB) interferometer are investigated theoretically by considering a local Rashba spin-orbit interaction. It shows that the spin-polarized linear conductance and the corresponding spin polarization each are a function of magnetic flux phase at zero bias voltage with a period of 2π, and that Hubbard U cannot influence the electron transport properties in this case. When adjusting appropriately structural parameter of inter-dot coupling and dot-lead coupling strength, the electronic spin polarization can reach a maximum value. Furthermore, by adjusting the bias voltages applied to the leads, the spin-up and spin-down currents move in opposite directions and pure spin current exists in the configuration space in appropriate situation. Based on the numerical results, such a model can be applied to the design of spin filter device.
中图分类号: (Electronic transport in mesoscopic systems)