Perfect spin-filter and highly spin-polarized current in a quantum network device
Perfect spin-filter and highly spin-polarized current in a quantum network device
复制标题
量子网络器件中的完美自旋滤波器和高自旋极化电流
DOI：
10.1063/1.3673840
复制
发表时间：
2012-01-02
影响因子：
4
通讯作者：
Yao, Kai-Lun
中科院分区：
文献类型：
--
作者：
Fu, Hua-Hua;Yao, Kai-Lun
报道了一种在由多个量子点组成的量子网络器件中实现理想自旋滤波和高自旋极化电流的设计。通过在上量子点和下量子点的位置能量之间产生能量差，线性电导谱呈现出定义良好的绝缘带，在适当的条件下，由于Fano反共振而具有非常陡峭的边缘。考虑到塞曼分裂，电导谱中出现了高达100%的自旋极化窗口，这使得该网络器件可以作为一个完美的自旋滤波器产生完全自旋极化的电流。这一思想为其他类似网络结构实现完美的自旋过滤器提供了一种可行的方法。
We report a design to realize perfect spin-filter and highly spin-polarized current in a quantum network device composed of multiple quantum dots (QDs). By producing an energy difference between the site energy of the upper QDs and down ones, the linear conductance spectra present well-defined insulating bands with very steep edges due to the Fano antiresonance in some suitable conditions. Considering a Zeeman splitting, highly to 100% spin-polarized windows appear in the conductance spectra, which makes the network device can be used as a perfect spin filter to generate completely spin-polarized current. This idea opens a practical way to prompt other similar configures of the network to realize perfect spin-filter.