Real higher-order Weyl photonic crystal

被引：0
作者：
Pan Y. [1 ,2 ,3 ,4 ]
Cui C. [5 ,6 ]
Chen Q. [1 ,2 ,3 ,4 ]
Chen F. [1 ,2 ,3 ,4 ]
Zhang L. [1 ,2 ,3 ,4 ]
Ren Y. [1 ,2 ,3 ,4 ]
Han N. [1 ,2 ,3 ,4 ]
Li W. [1 ,2 ,3 ,4 ]
Li X. [1 ,2 ,3 ,4 ]
Yu Z.-M. [5 ,6 ]
Chen H. [1 ,2 ,3 ,4 ]
Yang Y. [1 ,2 ,3 ,4 ]
机构：
[1] Interdisciplinary Center for Quantum Information, State Key Laboratory of Extreme Photonics and Instrumentation, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou
[2] International Joint Innovation Center, The Electromagnetics Academy at Zhejiang University, Zhejiang University, Haining
[3] Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang, Jinhua Institute of Zhejiang University, Zhejiang University, Jinhua
[4] Shaoxing Institute of Zhejiang University, Zhejiang University, Shaoxing
[5] Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing
[6] Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing
来源：
Nature Communications | / 14卷 / 1期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1038/s41467-023-42457-2
中图分类号：
学科分类号：
摘要：
Higher-order Weyl semimetals are a family of recently predicted topological phases simultaneously showcasing unconventional properties derived from Weyl points, such as chiral anomaly, and multidimensional topological phenomena originating from higher-order topology. The higher-order Weyl semimetal phases, with their higher-order topology arising from quantized dipole or quadrupole bulk polarizations, have been demonstrated in phononics and circuits. Here, we experimentally discover a class of higher-order Weyl semimetal phase in a three-dimensional photonic crystal (PhC), exhibiting the concurrence of the surface and hinge Fermi arcs from the nonzero Chern number and the nontrivial generalized real Chern number, respectively, coined a real higher-order Weyl PhC. Notably, the projected two-dimensional subsystem with kz = 0 is a real Chern insulator, belonging to the Stiefel-Whitney class with real Bloch wavefunctions, which is distinguished fundamentally from the Chern class with complex Bloch wavefunctions. Our work offers an ideal photonic platform for exploring potential applications and material properties associated with the higher-order Weyl points and the Stiefel-Whitney class of topological phases. © 2023, Springer Nature Limited.
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