Large spin Seebeck effects in zigzag-edge silicene nanoribbons
Large spin Seebeck effects in zigzag-edge silicene nanoribbons
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DOI：
10.1063/1.4892956
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发表时间：
2014-08
期刊：
影响因子：
1.6
通讯作者：
Xifeng Yang;Yu-Shen Liu;Jinfu Feng;Xuefeng Wang
中科院分区：
文献类型：
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作者：
Xifeng Yang;Yu-Shen Liu;Jinfu Feng;Xuefeng Wang
利用第一性原理方法，研究了双探针模型下具有单棱边的硅烯纳米带（ZSiNRs）的热自旋性质。与奇数宽度的ZSiNRs相比，偶数宽度的ZSiNRs的自旋Seebeck系数在室温下明显提高。这是由于不同自旋指数的线性电导带隙相对于由波函数的不同宇称引起的费米能级具有近乎完美的对称性。更有趣的是，相应的电荷塞贝克系数接近于零。因此，当在均匀宽度的ZSiNR中存在热偏置时，实现了几乎纯的自旋电流。同时，电流的自旋极化接近无穷大。
Using the first-principles methods, we investigate the thermospin properties of a two-probe model based on zigzag-edge silicene nanoribbons (ZSiNRs). Compared with the odd-width ZSiNRs, the spin Seebeck coefficient of the even-width ZSiNRs is obviously enhanced at room temperature. This fact is attributed to a nearly perfect symmetry of the linear conductance gap with the different spin index with respect to the Fermi level induced by the different parity of the wave functions. More interestingly, the corresponding charge Seebeck coefficient is near zero. Therefore, when a thermal bias is presented in the even-width ZSiNRs, a nearly pure spin current is achieved. Meanwhile, the spin polarization of the current approaches infinite.