Shen Rui-Song, Guo Yan-Dong, Yan Xiao-Hong, Zeng Hong-Li, Liang Miao-Shen, Chen Pei, Yang Mou-Shu, Ni Yang
College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
Key Laboratory of Radio Frequency and Micro Nano Electronics of Jiangsu Province, Nanjing 210023, China.
Phys Chem Chem Phys. 2021 Sep 22;23(36):20702-20708. doi: 10.1039/d1cp02547c.
Based on first-principles calculations, the spin-dependent electronic transport of nanoporous graphene nanoribbons is investigated. A three-terminal configuration is proposed, which can electronically control the spin polarization of transmission, instead of magnetic methods. By modulating the gate voltage, not only could the transmission be switched between completely spin up and spin down polarized states to realize a dual-spin filter, but also the spin polarization could be finely tuned between 100% and -100%. Any ratio of spin up to spin down transport electrons can be realized, providing more possibilities for the design of nanoelectronic devices. Further analysis shows that the transmission spectra, with two distinct transmission peaks with opposite spins around , are the key point, which are contributed by p orbitals. And such a phenomenon is robust to the width and length of the nanoporous graphene nanoribbons, suggesting that it is an intrinsic feature of these systems. The electrical control on spin polarization is realized in pure-carbon systems, showing great application potential.
基于第一性原理计算，研究了纳米多孔石墨烯纳米带的自旋相关电子输运。提出了一种三端配置，它可以通过电学方法而非磁学方法来控制传输的自旋极化。通过调制栅极电压，不仅可以在完全自旋向上和自旋向下极化状态之间切换传输以实现双自旋滤波器，而且自旋极化可以在100%和 -100%之间进行微调。可以实现任何自旋向上与自旋向下传输电子的比例，为纳米电子器件的设计提供了更多可能性。进一步分析表明，在 附近具有两个自旋相反的明显传输峰的传输谱是关键，这是由p轨道贡献的。并且这种现象对于纳米多孔石墨烯纳米带的宽度和长度具有鲁棒性，表明它是这些系统的固有特征。在纯碳系统中实现了对自旋极化的电学控制，显示出巨大的应用潜力。
