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Spin filtering in monolayer graphene by using an electro-magneto static barrier

机译：使用电磁静态势垒自旋过滤石墨烯

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摘要

Graphene has recently attracted many attentions for some special properties. One of the most important advantages of graphene is its very high electron mobility, which is essential to manipulate high-speed next generation transistors and other nano-electronic devices. Besides, because of the thin layer of carbon atoms in graphene, we can make ultra-small and extremely fast devices.In this research, we have considered a monolayer graphene subjected to an electro-magneto static field. By solving the Dirac equation analytically and finding the spin-dependent transmission probability for electrons through the barrier constructed by the electro-magneto static field, we have evaluated spin polarization in different conditions. Our results show there is no reduction in transmission for electrons that vertically go through the barrier. In other words, we have unit transmission probability at normal incidence, which is in complete accord with Klein paradox. In this case, there is not any polarization. However, spin polarization can be seen by increasing the incident angle.In some special magnetic field strengths and incident angels, spin-filtering can be occurred, in which only electrons with either spin-up or spin-down can pass through the barrier. Due to this fact, many graphene-base spintronic devices can be exploited in the near future.
机译：石墨烯最近因其一些特殊性能而引起了人们的关注。石墨烯的最重要优势之一是其极高的电子迁移率，这对于操纵高速下一代晶体管和其他纳米电子设备至关重要。此外，由于石墨烯中碳原子的薄层，我们可以制造超小型且极快的器件。在这项研究中，我们考虑了经受电磁静磁场的单层石墨烯。通过解析求解狄拉克方程，并找到电子通过电磁静磁场构成的势垒的自旋相关传输概率，我们评估了在不同条件下的自旋极化。我们的结果表明，垂直穿过势垒的电子的透射率没有降低。换句话说，我们在法向入射时具有单位传播概率，这完全符合克莱因悖论。在这种情况下，没有任何极化。但是，通过增加入射角可以看到自旋极化。在某些特殊的磁场强度和入射角度下，会发生自旋滤波，其中只有自旋向上或自旋向下的电子才能穿过势垒。由于这个事实，在不久的将来可以开发出许多基于石墨烯的自旋电子器件。

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