Using density functional theory in combination with non-equilibrium Green's functions, we investigate the spin transport in two heterostructures of graphene and hexagonal boron-nitride (h-BN) nanoribbons with C-B and C-N interfaces, respectively. Significant spin-filtering effect (over 80%) is observed in both C-B and C-N devices with bias ranging from 0 V to 0.3 V. Interestingly, the spin polarizations are opposite in these two devices, and prominent negative differential resistance (NDR) for both spin-up and spin-down currents is observed only in the C-N device. These findings provide insight into how the spin-transport properties of graphene/h-BN nanoribbons can be impacted by different types of interfaces of the heterostructures.

结合密度泛函理论和非平衡格林函数，我们研究了石墨烯和六方氮化硼（h -BN）纳米带分别具有CB和CN界面的两种异质结构中的自旋输运。在偏置范围为0 V至0.3 V的CB和CN器件中均观察到了显着的自旋滤波效果（超过80％）。有趣的是，这两个器件的自旋极化是相反的，并且两种器件的负负微分电阻（NDR）都很明显仅在CN器件中观察到向上旋转和向下旋转电流。这些发现为深入了解异质结构的不同类型的界面如何影响石墨烯/ h- BN纳米带的自旋传输性质。