Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/89332
Title: Experimental observation of optical Weyl points and Fermi arc-like surface states
Authors: Chong, Yi Dong
Chen, Kevin P.
Rechtsman, Mikael C.
Noh, Jiho
Huang, Sheng
Leykam, Daniel
Keywords: Photonic Crystals
Topological Matter
Issue Date: 2017
Source: Noh, J., Huang, S., Leykam, D., Chong, Y. D., Chen, K. P., & Rechtsman, M. C. (2017). Experimental observation of optical Weyl points and Fermi arc-like surface states. Nature Physics, 13(6), 611-617.
Series/Report no.: Nature Physics
Abstract: Weyl fermions are hypothetical two-component massless relativistic particles in three-dimensional (3D) space, proposed by Hermann Weyl in 1929. Their band-crossing points, called ‘Weyl points’, carry a topological charge and are therefore highly robust. There has been much excitement over recent observations of Weyl points in microwave photonic crystals and the semimetal TaAs. Here, we report on the experimental observation of ‘type-II’ Weyl points of light at optical frequencies, with the photons having a strictly positive group velocity along one spatial direction. We use a 3D structure consisting of laser-written waveguides, and show the presence of type-II Weyl points by observing conical diffraction along one axis when the frequency is tuned to the Weyl point; and observing the associated Fermi arc-like surface states. The realization of Weyl points at optical frequencies allows these novel electromagnetic modes to be further explored in the context of linear, nonlinear, and quantum optics.
URI: https://hdl.handle.net/10356/89332
http://hdl.handle.net/10220/44858
ISSN: 1745-2473
DOI: http://dx.doi.org/10.1038/nphys4072
Rights: © 2017 Macmillan Publishers Limited, part of Springer Nature. This is the author created version of a work that has been peer reviewed and accepted for publication by Nature Physics, Macmillan Publishers Limited, part of Springer Nature. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1038/nphys4072].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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