Observation of Quadratic (Charge-2) Weyl Point Splitting in Near-Infrared Photonic Crystals
| Autor: | Christina Jörg, Sachin Vaidya, Jiho Noh, Alexander Cerjan, Shyam Augustine, Georg von Freymann, Mikael C. Rechtsman |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter - Mesoscale and Nanoscale Physics
Mesoscale and Nanoscale Physics (cond-mat.mes-hall) FOS: Physical sciences Condensed Matter Physics Mathematics::Representation Theory Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Physics - Optics Optics (physics.optics) |
| DOI: | 10.48550/arxiv.2106.12119 |
| Popis: | Weyl points are point degeneracies that occur in momentum space of periodic materials, and are associated with a quantized topological charge. We experimentally observe in a 3D micro-printed photonic crystal that a charge-2 Weyl point can be split into two charge-1 Weyl points as the protecting symmetry of the original charge-2 Weyl point is broken. Moreover, we use a theoretical analysis to confirm where the charge-1 Weyl points move within the Brillouin zone as the strength of the symmetry breaking increases, and confirm it in experiments using Fourier-transform infrared spectrometry. This micro-scale observation and control of Weyl points is important for realizing robust topological devices in the near-infrared. |
| Databáze: | OpenAIRE |
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