Giant decreasing of spin current in a single molecular junction with twisted zigzag graphene nanoribbon electrodes
Giant decreasing of spin current in a single molecular junction with twisted zigzag graphene nanoribbon electrodes
复制标题
扭曲之字形石墨烯纳米带电极单分子结中的自旋电流大幅减少
DOI：
10.1016/j.carbon.2016.09.022
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发表时间：
2016-12-01
期刊：
影响因子：
10.9
通讯作者：
Li, Shu-Shen
中科院分区：
文献类型：
--
作者：
Fan, Zhi-Qiang;Xie, Fang;Li, Shu-Shen
Molecular spintronics is a new and emergent sub-area of spintronics that has the potential use in future information storage, magnetic sensing and quantum computing. We investigate the spin transport properties of a single benzene molecule connected to zigzag graphene nanoribbons (ZGNRs) by using a self-consistent ab initio approach which combines the non-equilibrium Green's function (NEGF) formalism with density functional theory (DFT). The spin-resolved current-voltage characteristics of the single benzene molecule at finite biases are different while the left and right zigzag graphene electrodes with the parallel (P) and anti-parallel (AP) magnetism configurations. The perfect (100%) spin polarization in a large bias region can be realized with both P and AP magnetism configuration. However, the spin-resolved rectifications are only found with AP magnetism configuration. More importantly, both of the alpha-spin and beta-spin currents would drop remarkably when one ZGNR electrode is twisted. Especially the alpha-spin currents with P magnetism configuration will decrease by up to 8 orders of magnitude when the twisted angle reaches 90. The above results demonstrate that this junction holds promise in the design of a high-performance multifunctional single-molecule spintronic device. (C) 2016 Elsevier Ltd. All rights reserved.
