石墨烯纳米带异质结的热自旋输运性质的研究

Thermal Spin Transport Properties of Graphene Nanoribbons Heterojunction

石墨烯纳米带及其异质结因其丰富而优异的物理性质,引起了人们的广泛关注。基于密度泛函理论结合非平衡态格林函数方法研究了不同宽度碳链N(N=6、8、10)的单氢钝化和双氢钝化的石墨烯纳米带所构成的异质结的热自旋输运特征,在N=6体系中发现了热自旋过滤效应;N=8体系中发现了自旋塞贝克效应;N=10体系中发现了自旋塞贝克效应、负微分自旋塞贝克效应以及热负微分电阻效应,为热自旋纳米电子学器件的研究提供了理论指导。

Graphene nanoribbons and heterojunction have aroused wide concern due to theirs rich and excellent physical properties.In this paper,using density functional theory combined with the nonequilibrium Greens function method,thermal spin transport characteristics of nano electronic devices with different number carbon chain(N=6 y 8,10)was studied,which is a heterojunction consisting of a left electrode(ZGNR-1H1H)and a right electrode(ZGNR-2H2H).In the N=6 system,we found the thermal spin filtering effect,and at the same time in the=8 system found the spin Seebeck effect.We obtained the spin Seebeck effect,negative differential spin Seebeck effect together with negative differential resistance effect in the=10 system.The calculated results indicating that these system can be used in the thermal spin nanodevices.