Weyl超材料的涡旋反射和螺旋费米弧
Vortical Reflection and Spiraling Fermi Arcs with Weyl Metamaterials
摘要：
外尔半金属的散射和输运在凝聚态物理中引起了越来越多的关注，其中包括手征零模以及相关的磁阻和手征磁效应。在这些研究中通常进行电导测量，然而，这不能解决电子的动量，阻止直接观察与Weyl点相关的散射矩阵中的相位奇异性。在这里，我们实验证明了螺旋相位分布的角度（动量）分辨散射矩阵的电磁波在光子Weyl超材料。它进一步导致夹在外尔超材料和金属板之间的空气间隙中的螺旋费米弧。利用角涡旋反射的无损耗特性，我们的研究结果为利用光子外尔系统操纵光学角动量建立了一个新的平台。
英文摘要：
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.
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