外尔电路的Berry曲率和费米弧的探讨
Probing the Berry Curvature and Fermi Arcs of a Weyl Circuit
摘要：
外尔粒子是光子的无质量费米子表亲。虽然没有基本的外尔粒子已经确定，它们出现在凝聚态和超材料系统中，在那里它们的旋量性质对低能色散和表面性质施加了拓扑约束。在这里，我们展示了一个拓扑电路与外尔色散在低动量，实现了一个3D晶格，表现为一个半通量霍夫斯塔德模型在所有的主平面。该电路平台提供了对所有体态和表面态的完整复值自旋纹理的访问，从而不仅揭示了外尔点和连接其表面投影的费米弧的存在，而且还首次揭示了通过布里渊区的Berry曲率分布和外尔点的相关量化手征电荷。这项工作开辟了一条探索超导电路中相互作用的外尔物理的道路，以及研究流形拓扑如何影响三维能带拓扑。
英文摘要：
The Weyl particle is the massless fermionic cousin of the photon. While no fundamental Weyl particles have been identified, they arise in condensed matter and meta-material systems, where their spinor nature imposes topological constraints on low-energy dispersion and surface properties. Here we demonstrate a topological circuit with Weyl dispersion at low-momentum, realizing a 3D lattice that behaves as a half-flux Hofstadter model in all principal planes. The circuit platform provides access to the complete complex-valued spin-texture of all bulk- and surface- states, thereby revealing not only the presence of Weyl points and the Fermi arcs that connect their surface-projections, but also, for the first time, the Berry curvature distribution through the Brillouin zone and the associated quantized Chiral charge of the Weyl points. This work opens a path to exploration of interacting Weyl physics in superconducting circuits, as well as studies of how manifold topology impacts band topology in three dimensions.
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