Axisymmetric All-Carbon Devices with High-Spin Filter Efficiency, Large-Spin Rectifying, and Strong-Spin Negative Differential Resistance Properties

• Published in: Journal of physical chemistry. C Vol. 120; no. 1; pp. 668 - 676
• Main Authors: Hong, X. K, Kuang, Y. W, Qian, C, Tao, Y. M, Yu, H. L, Zhang, D. B, Liu, Y. S, Feng, J. F, Yang, X. F, Wang, X. F
• Format: Journal Article
• Language: English
• Published: American Chemical Society 14.01.2016
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/acs.jpcc.5b09180

We propose the perfect all-carbon axisymmetric spintronic devices consisting of a zigzag-edged trigonal graphene (ZTG) linked to left and right zigzag-edged graphene nanoribbons (ZGNR) electrodes via carbon atomic chains (CACs). To ensure the stability of the system, the edge carbon atoms are passivated by hydrogen atoms. The self-consistent density functional theory (DFT) calculations show that the simple all-carbon system possesses the prefect spin-filtering property at a wide voltage region from −1.0 to 1.0 V. More importantly, the proposed system can act as a perfect dual spin diode in the antiparallel (AP) spin configuration, and the single-spin rectifying ratio can reach 103. When we add the number of the CACs linked to the left ZGNR electrode, the device shows the obvious single-spin negative differential resistance (NDR) behavior, which originates from the appearance of the localized states in the region of the left ZGNR electrode and ZTG. Meanwhile, the perfect spin-filtering and dual spin-diode properties are also retained in the all-carbon spintronic device, and the single-spin rectifying ratio can be enhanced to about 104.