锯齿形α-石墨烯纳米带的巨磁电阻和自旋Seebeck系数
Giant magnetoresistance and spin Seebeck coefficient in zigzag a-graphyne nanoribbons
摘要：
利用密度泛函理论结合非平衡格林函数方法研究了铁磁石墨-石墨纳米带（ZGNRs）的自旋相关的电学和热电性质.在原始的均匀宽度ZGNRs中获得巨磁阻，并且可以高达10e6%。然而，对于掺杂的系统，大的磁阻行为可能出现在奇数宽度的ZGNR而不是偶数宽度的。这表明ZGNR边缘的掺杂可以在很宽的范围内操纵磁阻。另一个有趣的现象是，在B和N掺杂的均匀宽度ZGNR的自旋塞贝克系数总是大于电荷塞贝克系数，和纯自旋电流热自旋器件可以在特定的温度下实现。
英文摘要：
We investigate the spin-dependent electric and thermoelectric properties of ferromagnetic zigzag-graphyne nanoribbons (ZGNRs) using the density-functional theory combined with the non-equilibrium Green's function method. A giant magnetoresistance is obtained in the pristine even-width ZGNRs and can be as high as 10e6 %. However, for the doped systems, a large magnetoresistance behavior may appear in the odd-width ZGNRs rather than the even-width ones. This suggests that the magnetoresistance can be manipulated in a wide range by the dopants on edges of ZGNRs. Another interesting phenomenon is that in the B- and N-doped even-width ZGNRs the spin Seebeck coefficient is always larger than the charge Seebeck coefficient, and a pure-spin-current thermospin device can be achieved at specific temperatures.
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