Experimental observation of Weyl points
Author(s)Lu, Ling; Wang, Zhiyu; Ye, Dexin; Ran, Lixin; Fu, Liang; Joannopoulos, John D.; Soljacic, Marin; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Institute for Soldier Nanotechnologies; Massachusetts Institute of Technology. Department of Physics
American Association for the Advancement of Science (AAAS)
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).
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