Observation of a Charge-2 Photonic Weyl Point in the Infrared

Sachin Vaidya, Jiho Noh, Alexander Cerjan, Christina Jörg, Georg Von Freymann, Mikael C. Rechtsman

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number253902
JournalPhysical review letters
Volume125
Issue number25
DOIs
StatePublished - Dec 17 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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