College of Physics, Optoelectronics and Energy, Soochow University, 1 Shizi Street, Suzhou, Jiangsu 215006, China.
Nanoscale. 2014 Oct 7;6(19):11121-9. doi: 10.1039/c4nr02426e.
We investigate the spin-dependent electric and thermoelectric properties of ferromagnetic zigzag α-graphyne nanoribbons (ZαGNRs) using density-functional theory combined with non-equilibrium Green's function method. A giant magnetoresistance is obtained in the pristine even-width ZαGNRs and can be as high as 10(6)%. However, for the doped systems, a large magnetoresistance behavior may appear in the odd-width ZαGNRs rather than the even-width ones. This suggests that the magnetoresistance can be manipulated in a wide range by the dopants on the edges of ZαGNRs. Another interesting phenomenon is that in the B- and N-doped even-width ZαGNRs 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.
我们使用密度泛函理论结合非平衡格林函数方法研究了铁磁锯齿形α-石墨炔纳米带（ZαGNRs）的自旋相关电和热电性质。在原始的偶数宽度 ZαGNRs 中获得了巨大的磁电阻，高达 10(6)%。然而，对于掺杂系统，奇数宽度 ZαGNRs 中可能出现较大的磁电阻行为，而不是偶数宽度 ZαGNRs。这表明通过 ZαGNRs 边缘的掺杂剂可以在很宽的范围内控制磁电阻。另一个有趣的现象是，在 B 和 N 掺杂的偶数宽度 ZαGNRs 中，自旋 Seebeck 系数总是大于电荷 Seebeck 系数，并且在特定温度下可以实现纯自旋电流热自旋器件。
