Ni Yun, Li Jia, Tao Wei, Ding Hao, Li Rui-Xue
Hubei Engineering Technology Research Center of Energy Photoelectric Device and System, Hubei University of Technology, Wuhan, 430068, China.
Department of Basic Science, Wenhua College, Wuhan, 430074, China.
Phys Chem Chem Phys. 2021 Feb 4;23(4):2753-2761. doi: 10.1039/d0cp05640e.
Zigzag-edged graphene nanoribbons (ZGNRs) have important applications in spintronics and spin caloritronics. While in the preparation of a ZGNR, defects like the graphene nanobubbles often appear, which may affect the physical properties of the ZGNR. In this paper, we studied the transport properties of a defected ZGNR with a graphene nanobubble by performing first-principles quantum transport calculations. The results show that when the nanobubble is intact and locates at the centre, the spin polarization and magnetoresistance tend to drop off in the low bias voltage cases, compared to the ideal ZGNR. While when the nanobubble is split and locates at the edge, all the transport properties are significantly affected and altered, such as the spin polarization, the giant magnetoresistance effect and the spin Seebeck effect. Meanwhile, some new results are obtained from the device, including the negative differential resistance effect and the pure thermal-induced spin-current.
锯齿状边缘的石墨烯纳米带（ZGNRs）在自旋电子学和自旋热电子学中具有重要应用。在制备ZGNR的过程中，常常会出现诸如石墨烯纳米气泡之类的缺陷，这可能会影响ZGNR的物理性质。在本文中，我们通过进行第一性原理量子输运计算，研究了带有石墨烯纳米气泡的缺陷ZGNR的输运性质。结果表明，当纳米气泡完整且位于中心时，与理想ZGNR相比，在低偏置电压情况下，自旋极化和磁电阻趋于下降。而当纳米气泡分裂并位于边缘时，所有的输运性质都会受到显著影响并发生改变，例如自旋极化、巨磁电阻效应和自旋塞贝克效应。同时，从该器件中获得了一些新的结果，包括负微分电阻效应和纯热诱导自旋电流。
