论文标题
Weyl超材料
Vortical Reflection and Spiraling Fermi Arcs with Weyl Metamaterials
论文作者
论文摘要
Weyl半法的散射和运输引起了凝结物理学的越来越多的注意力，其中包括手性零模式以及相关的磁倍率和手性磁效应。这些研究通常在这些研究中进行测量，但是，这些研究无法解析电子的动量，从而阻止了与Weyl点相关的散射矩阵中的相位奇异性的直接观察。在这里，我们在实验上证明了光子Weyl超材料中电磁波的角度（动量）分辨散射基质的螺旋相分布。它进一步导致在夹在Weyl超材料和金属板之间的空气间隙中螺旋式费米弧。我们的发现受益于角度涡度反射的无对齐特征，在用光子Weyl系统操纵光学角动量方面建立了一个新平台。
Scatterings and transport in Weyl semimetals have caught growing attention in condensed matter physics, with observables including chiral zero modes and the associated magnetoresistance and chiral magnetic effects. Measurement of electrical conductance is usually performed in these studies, which, however, cannot resolve the momentum of electrons, preventing direct observation of the phase singularities in scattering matrix associated with Weyl point. Here we experimentally demonstrate a helical phase distribution in the angle (momentum) resolved scattering matrix of electromagnetic waves in a photonic Weyl metamaterial. It further leads to spiraling Fermi arcs in an air gap sandwiched between a Weyl metamaterial and a metal plate. Benefiting from the alignment-free feature of angular vortical reflection, our findings establish a new platform in manipulating optical angular momenta with photonic Weyl systems.
