Perfect Spin Filter in a Tailored Zigzag Graphene Nanoribbon.
Perfect Spin Filter in a Tailored Zigzag Graphene Nanoribbon.
复制标题
定制锯齿形石墨烯纳米带中的完美旋转过滤器
DOI：
10.1186/s11671-017-2132-7
复制
发表时间：
2017-12
影响因子：
--
通讯作者：
Li H
中科院分区：
文献类型：
--
作者：
Kang D;Wang B;Xia C;Li H
锯齿形石墨烯纳米带(ZGNR)有望成为全碳自旋电子器件的重要组成部分。基于ZGNRs的高自旋滤光器效率和低实验复杂度的器件的制造仍然是一个挑战。利用密度泛函理论和非平衡态格林函数技术，研究了锯齿形石墨烯纳米带的自旋输运性质。在ZGNR的定制结构中发现了完美的自旋过滤效应。在器件上施加均匀的磁场，可以获得接近100%的自旋极化电流和高的磁阻比。在理想的自旋过滤中，桥碳原子的自旋上、下态分布起着主导作用。ZGNR的定制为基于石墨烯的自旋电子学提供了一种新的有效途径。
Zigzag graphene nanoribbons (ZGNRs) are expected to serve as the promising component in the all-carbon spintronic device. It remains challenging to fabricate a device based on ZGNRs with high spin-filter efficiency and low experimental complexity. Using density functional theory combined with nonequilibrium Green’s function technique, we studied the spin-dependent transport properties of the tailored zigzag graphene nanoribbon. A perfect spin-filtering effect is found in the tailored structure of ZGNR. The nearly 100% spin-polarized current and high magneto-resistance ratio can be obtained by applying a homogeneous magnetic field across the device. The distribution of spin up and spin down states at the bridge carbon atom plays a dominant role in the perfect spin filtering. The tailoring of ZGNR provides a new effective approach to graphene-based spintronics.