在石墨烯中产生和操纵高方向性电子束
Creating and Steering Highly Directional Electron Beams in Graphene
摘要：
我们提出了一个概念，以创建高度准直，非色散的电子束在伪相对论狄拉克材料，如石墨烯或拓扑绝缘体表面。结合负折射和克莱因准直在一个抛物线PN结，建议的透镜产生的光束，作为焦距一样窄，保持在几个微米的尺度上聚焦，并可以通过磁场引导而不会失去准直。我们证明了镜头的能力，通过将其应用到两个范例设置的石墨烯电子光学：我们提出了一个设置，用于观察高分辨率的角度依赖性克莱因隧穿，并利用这些聚焦电子波的密切量子经典对应，我们认为高保真横向磁聚焦伴随着模拟电流映射通过扫描门显微镜。我们的提议为下一代石墨烯电子光学实验开辟了新的前景。
英文摘要：
We put forward a concept to create highly collimated, non-dispersive electron beams in pseudo-relativistic Dirac materials such as graphene or topological insulator surfaces. Combining negative refraction and Klein collimation at a parabolic pn junction, the proposed lens generates beams, as narrow as the focal length, that stay focused over scales of several microns and can be steered by a magnetic field without losing collimation. We demonstrate the lens capabilities by applying it to two paradigmatic settings of graphene electron optics: We propose a setup for observing high-resolution angle-dependent Klein tunneling, and, exploiting the intimate quantum-to-classical correspondence of these focused electron waves, we consider high-fidelity transverse magnetic focusing accompanied by simulations for current mapping through scanning gate microscopy. Our proposal opens up new perspectives for next-generation graphene electron optics experiments.
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