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Revival resonant scattering, perfect caustics, and isotropic transport of pseudospin-1 particles

机译：伪共振1粒子的复兴共振散射，完美的碱度和各向同性传输

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摘要

We report unusual physics associated with wave scattering in pseudospin-1 systems whose band structure consists of a conventional Dirac cone and a topologically flat band. First, for small scatterer size, we find a surprising revival resonant scattering phenomenon and identify a peculiar type of boundary trapping profile through the formation of unusual vortices as the physical mechanism. Second, for larger scatterer size, a perfect caustic phenomenon arises as a manifestation of the super-Klein tunneling effect, leading to the scatterer's being effectively as a Veselago lens. Third, in the far scattering field, an unexpected isotropic behavior emerges at low energies, which can be attributed to the vanishing Berry phase for massless pseudospin-1 particles and, consequently, to constructive interference between the time-reversed backscattering paths. We develop an analytic theory based on the generalized Dirac-Weyl equation to fully explain these phenomena and articulate experimental schemes with photonic or electronic systems.
机译：我们报告了与伪自旋1系统中的波散射相关的异常物理学，伪自旋1系统的能带结构由传统的狄拉克锥和拓扑平坦的能带组成。首先，对于较小的散射体，我们发现了令人惊讶的复兴共振散射现象，并通过形成异常涡旋作为物理机制来确定了特殊类型的边界俘获轮廓。其次，对于较大的散射体，超级Klein隧穿效应的表现会出现完美的苛性现象，从而使散射体有效地作为Veselago透镜。第三，在远散射场中，在低能量下会出现意想不到的各向同性行为，这可归因于无质量的假自旋1粒子的贝里相消失，因此，是时间反向散射路径之间的相长干涉。我们基于广义Dirac-Weyl方程开发了一种解析理论，以充分解释这些现象并阐明光子或电子系统的实验方案。

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    《Physical review》 |2016年第16期|165405.1-165405.16|共16页
  • 作者

    Hong-Ya Xu; Ying-Cheng Lai;

  • 作者单位

    School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287, USA;

    School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287, USA,Department of Physics, Arizona State University, Tempe, Arizona 85287, USA;

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