@article{f5f53e367df346dfb718394126ecc75b,
title = "Observation of a Charge-2 Photonic Weyl Point in the Infrared",
abstract = "Weyl points are robust point degeneracies in the band structure of a periodic material, which act as monopoles of Berry curvature. They have been at the forefront of research in three-dimensional topological materials as they are associated with novel behavior both in the bulk and on the surface. Here, we present the experimental observation of a charge-2 photonic Weyl point in a low-index-contrast photonic crystal fabricated by two-photon polymerization. The reflection spectrum obtained via Fourier-transform infrared spectroscopy closely matches simulations and shows two bands with quadratic dispersion around a point degeneracy.",
author = "Sachin Vaidya and Jiho Noh and Alexander Cerjan and Christina J{\"o}rg and {Von Freymann}, Georg and Rechtsman, {Mikael C.}",
note = "Funding Information: M. C. R. acknowledges support from the ONR YIP program under Grant No. N00014-18-1-2595, the Packard Foundation (2017-66821), and the Penn State NSF-MRSEC Center for Nanoscale Science, under Grant No. DMR-1420620. J. N. acknowledges support by Corning Incorporated Office of STEM Graduate Research. C. J. gratefully acknowledges funding from the Alexander von Humboldt Foundation within the Feodor-Lynen Fellowship program. G. v. F. acknowledges support by the Deutsche Forschungsgemeinschaft through CRC/Transregio 185 OSCAR (project no. 277625399). We are grateful to Josh Stapleton and Tawanda J. Zimudzi for technical help with the FTIR spectrometer and Kathleen Gehoski for technical help with Nanoscribe. S. V. acknowledges Debadarshini Mishra for helpful discussions on the topic. ",
year = "2020",
month = dec,
day = "17",
doi = "10.1103/PhysRevLett.125.253902",
language = "English (US)",
volume = "125",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "25",
}