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Veselago focusing of anisotropic massless Dirac fermions

机译：Veselago聚焦各向异性无抽炎迪米米

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摘要

Massless Dirac fermions (MDFs) emerge as quasiparlicles in various novel materials such as graphene and topological insulators, and they exhibit several intriguing properties, of which Veselago focusing is an outstanding example with a lot of possible applications. However, up to now Veselago focusing merely occurred in p-n junction devices based on the isotropic MDE which lacks the tunability needed for realistic applications. Here, motivated by the emergence of novel Dirac materials, we investigate the propagation behaviors of anisotropic MDFs in such a p-n junction structure. By projecting the Hamiltonian of the anisotropic MDF to that of the isotropic MDF and deriving an exact analytical expression for the propagator, precise Veselago focusing is demonstrated without the need for mirror symmetry of the electron source and its focusing image. We show a tunable focusing position that can be used in a device to probe masked atom-scale defects. This study provides an innovative concept to realize Veselago focusing relevant for potential applications, and it paves the way for the design of novel electron optics devices by exploiting the anisotropic MDF.
机译：无阻塞Dirac Fermions（MDF）在各种新颖材料中散发出QuaSiparly，例如石墨烯和拓扑绝缘体，它们表现出几种有趣的性质，其中Veselago聚焦是具有大量可能应用的杰出例子。然而，到目前为止，基于各向同性MDE的P-N结装置仅发生在P-N结装置中的Veselago聚焦的veselago重点是缺乏现实应用所需的可调性。这里，通过新型Dirac材料的出现，我们研究了这种P-N结结构中各向异性MDF的传播行为。通过将各向异性MDF的哈密顿突出到各向同性MDF的Hamiltonian并导出用于传播者的精确分析表达，在没有对电子源及其聚焦图像的镜像对称的情况下证明了精确的Veselago聚焦。我们显示可调谐聚焦位置，可用于设备以探测屏蔽原子尺度缺陷。本研究提供了一种创新的概念，实现了Veselago对潜在应用相关的关注，它通过利用各向异性MDF来铺平新型电子光学器件的设计。

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  • 来源
    《Physical review》 |2018年第20期|205437.1-205437.7|共7页
  • 作者

    Shu-Hui Zhang; Wen Yang; F. M. Peelers;

  • 作者单位

    College of Science Beijing University of Chemical Technology Beijing 100029 China;

    Beijing Computational Science Research Center Beijing 100193 China;

    Department of Physics University of Antwerp Groenenborgerlaan 171 B-2020 Antwerpen Belgium;

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