Atomistic switch of giant magnetoresistance and spin thermopower in graphene-like nanoribbons.

Atomistic switch of giant magnetoresistance and spin thermopower in graphene-like nanoribbons.
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类石墨烯纳米带中巨磁阻和自旋热电的原子开关

DOI:
10.1038/srep36762
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发表时间:
2016-11-18
期刊:
影响因子:
4.6
通讯作者:
Wang XF
Wang XF
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhai MX;Wang XF

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我们证明了在偶(奇)宽的锯齿形类石墨烯纳米带中,巨磁电阻可以通过原子栅势或反平行(AP)磁位形的磁区内部的边缘无序来关闭(开启)。还预测了一个很强的磁热电势效应,即在AP构型中,在电荷热电势保持较低的情况下,自旋热电势可以得到极大的增强。从紧束缚模型中提取的结果与边缘掺杂石墨烯纳米带的第一性原理模拟结果符合得很好。在最简单的情况下,为了便于在一般情况下进行定性分析,得到了解析表达式。
We demonstrate that the giant magnetoresistance can be switched off (on) in even- (odd-) width zigzag graphene-like nanoribbons by an atomistic gate potential or edge disorder inside the domain wall in the antiparallel (ap) magnetic configuration. A strong magneto-thermopower effect is also predicted that the spin thermopower can be greatly enhanced in the ap configuration while the charge thermopower remains low. The results extracted from the tight-binding model agree well with those obtained by first-principles simulations for edge doped graphene nanoribbons. Analytical expressions in the simplest case are obtained to facilitate qualitative analyses in general contexts.
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