Observation of Quadratic (Charge-2) Weyl Point Splitting in Near-Infrared Photonic Crystals
- Weyl points are point degeneracies that occur in momentum space of 3D periodic materials and are associated with a quantized topological charge. Here, the splitting of a quadratic (charge-2) Weyl point into two linear (charge-1) Weyl points in a 3D micro-printed photonic crystal is observed experimentally via Fourier-transform infrared spectroscopy. Using a theoretical analysis rooted in symmetry arguments, it is shown that this splitting occurs along high-symmetry directions in the Brillouin zone. This micro-scale observation and control of Weyl points is important for realizing robust topological devices in the near-infrared.
Author: | Christina Jörg, Sachin Vaidya, Jiho Noh, Alexander Cerjan, Shyam Augustine, Georg von Freymann, Mikael C. Rechtsman |
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URN: | urn:nbn:de:hbz:386-kluedo-80355 |
DOI: | https://doi.org/10.1002/lpor.202100452 |
ISSN: | 1863-8899 |
Parent Title (English): | Laser & Photonics Reviews |
Publisher: | Wiley |
Document Type: | Article |
Language of publication: | English |
Date of Publication (online): | 2024/04/16 |
Year of first Publication: | 2022 |
Publishing Institution: | Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau |
Date of the Publication (Server): | 2024/04/16 |
Issue: | 16/1 |
Page Number: | 6 |
Source: | https://onlinelibrary.wiley.com/doi/10.1002/lpor.202100452 |
Faculties / Organisational entities: | Kaiserslautern - Fachbereich Physik |
DDC-Cassification: | 5 Naturwissenschaften und Mathematik / 530 Physik |
Collections: | Open-Access-Publikationsfonds |
Licence (German): | Zweitveröffentlichung |