Experimental observation of Weyl points
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Soljacic_Experimental observation.pdf
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2.53 MB
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Author(s)
Lu, Ling
Wang, Zhiyu
Ye, Dexin
Ran, Lixin
Fu, Liang
Joannopoulos, John D.
Soljacic, Marin
Date Issued
July 2015
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Lu, L., Z. Wang, D. Ye, L. Ran, L. Fu, J. D. Joannopoulos, and M. Soljacic. “Experimental Observation of Weyl Points.” Science (July 16, 2015).
Version
Author's final manuscript
Abstract
The massless solutions to the Dirac equation are described by the so-called Weyl Hamiltonian. The Weyl equation requires a particle to have linear dispersion in all three dimensions while being doubly degenerate at a single momentum point. These Weyl points are topological monopoles of quantized Berry flux exhibiting numerous unusual properties. We performed angle-resolved microwave transmission measurements through a double-gyroid photonic crystal with inversion-breaking where Weyl points have been theoretically predicted to occur. The excited bulk states show two linear dispersion bands touching at four isolated points in the three-dimensional Brillouin zone, indicating the observation of Weyl points. This work paves the way to a variety of photonic topological phenomena in three dimensions.
MIT Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1126/science.aaa9273
