Wang Hanyu, Xu Wei, Wei Zeyong, Wang Yiyuan, Wang Zhanshan, Cheng Xinbin, Guo Qinghua, Shi Jinhui, Zhu Zhihong, Yang Biao
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China.
Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha, 410073, China.
Nat Commun. 2024 Mar 18;15(1):2440. doi: 10.1038/s41467-024-46759-x.
As a milestone in the exploration of topological physics, Fermi arcs bridging Weyl points have been extensively studied. Weyl points, as are Fermi arcs, are believed to be only stable when preserving translation symmetry. However, no experimental observation of aperiodic Fermi arcs has been reported so far. Here, we continuously twist a bi-block Weyl meta-crystal and experimentally observe the twisted Fermi arc reconstruction. Although both the Weyl meta-crystals individually preserve translational symmetry, continuous twisting operation leads to the aperiodic hybridization and scattering of Fermi arcs on the interface, which is found to be determined by the singular total reflection around Weyl points. Our work unveils the aperiodic scattering of Fermi arcs and opens the door to continuously manipulating Fermi arcs.
作为拓扑物理探索中的一个里程碑，连接外尔点的费米弧已得到广泛研究。与费米弧一样，外尔点被认为只有在保持平移对称性时才是稳定的。然而，到目前为止尚未有关于非周期费米弧的实验观测报道。在此，我们持续扭转一个双块外尔超晶体，并通过实验观测到扭转的费米弧重构。尽管单个外尔超晶体都保持平移对称性，但连续的扭转操作会导致界面上费米弧的非周期杂化和散射，发现这是由外尔点周围的奇异全反射决定的。我们的工作揭示了费米弧的非周期散射，并为连续操纵费米弧打开了大门。
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