Symmetric and antisymmetric electric fields induced spin valves in a zigzag silicene nanoribbon ferromagnetic junction
Symmetric and antisymmetric electric fields induced spin valves in a zigzag silicene nanoribbon ferromagnetic junction
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DOI：
10.1088/1361-648x/ab3cf4
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发表时间：
2019-09
期刊：
影响因子：
--
通讯作者：
Lin Zhang
中科院分区：
文献类型：
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作者：
Lin Zhang
我们报道了一种可能的二维自旋开关，它是基于一个具有两个垂直交错电场的偶链锯齿形硅烯纳米晶（ZIGR）铁磁结。通过计算器件的横向电导，发现无论两个交错电场沿带的y轴是沿着对称还是反对称，系统都能发生金属-绝缘体相变，可以作为电调谐自旋阀来过滤和探测一类自旋态.当外加两个对称的交错电场时，由于均匀的交错势打开的能隙，上自旋和下自旋电子都被禁止在同一能区输运，这与两个电场是完全分布还是部分分布无关。当两个交错电场作用在BRR结上时，BRR结与未加电场的BRR结具有相同的能带对称性（赝宇称），出现能带选择规则，结合交错势可以产生、分离和探测100%极化自旋电流.我们的研究结果可能为在二维石墨烯类材料中设计电可控自旋开关提供一种可能的方法。
We report a possible two dimensional spin switch based on an even-chain zigzag silicene nanoribbon (ZSR) ferromagnetic junction with two perpendicular staggered electric fields. By calculating the transverse conductance of the device, we find that the metal-insulator phase transition could always occur in the system regardless of two staggered electric fields are symmetric or antisymmetric along the y -axis of the ribbon, which can act as an electrical tunable spin valve to filter and detect one species of spin state. When two symmetric staggered electric fields are applied, both spin up and spin down electrons are prohibited to transport in the same energy region due to the energy gap opened by the homogeneous staggered potentials, which is independent of whether two electric fields are fully or partially distributed. When two staggered electric fields are anti-symmetrically put on the ZSR junction, it has the same energy band symmetry(pseudo-parity) as the pristine ZSR without applying the electric field, the energy band selection rule appears and can be used to generate, separate and detect 100% polarized spin currents combined with the staggered potential. Our findings may provide a possible way to design an electrical controllable spin switch in two dimensional graphene-like materials.