Journal
SCIENCE
Volume 359, Issue 6379, Pages 1013-1016Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaq1221
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Funding
- European Research Council Consolidator Grant (Topological), Horizon Action Project grant [734578]
- Leverhulme Trust [RPG-2012-674]
- Royal Society and Wolfson Foundation
- China Scholarship Council [201306110041]
- National Natural Science Foundation of China [11604216, 61490713]
- Engineering and Physical Sciences Research Council of the United Kingdom [EP/L015331/1]
- National Key Research and Development Program of China [2016YFA0302400]
- National Natural Science Foundation of China (NSFC) [11674370]
- National Key RAMP
- D Program of China [2016YFA0302400, 2017YFA0303800]
- NSFC [11721404]
- Engineering and Physical Sciences Research Council [1469872] Funding Source: researchfish
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Weyl points are the crossings of linearly dispersing energy bands of three-dimensional crystals, providing the opportunity to explore a variety of intriguing phenomena such as topologically protected surface states and chiral anomalies. However, the lack of an ideal Weyl system in which the Weyl points all exist at the same energy and are separated from any other bands poses a serious limitation to the further development of Weyl physics and potential applications. By experimentally characterizing a microwave photonic crystal of saddle-shaped metallic coils, we observed idealWeyl points that are related to each other through symmetry operations. Topological surface states exhibiting helicoidal structure have also been demonstrated. Our system provides a photonic platform for exploring idealWeyl systems and developing possible topological devices.
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