Observation of Quadratic (Charge-2) Weyl Point Splitting in Near-Infrared Photonic Crystals

Jörg, Christina; Vaidya, Sachin; Noh, Jiho; Cerjan, Alexander; Augustine, Shyam; von Freymann, Georg; Rechtsman, Mikael C.

doi:10.1002/lpor.202100452

Observation of Quadratic (Charge-2) Weyl Point Splitting in Near-Infrared Photonic Crystals

Journal Article · Thu Dec 09 23:00:00 EST 2021 · Laser & Photonics Reviews

DOI:https://doi.org/10.1002/lpor.202100452· OSTI ID:1841983

^[1]; ^[2]; ^[3]; Cerjan, Alexander ^[4]; Augustine, Shyam ^[5]; ^[6]; ^[2]

Technische Univ. Kaiserslautern (Germany). Research Center OPTIMAS; Pennsylvania State Univ., University Park, PA (United States)
Pennsylvania State Univ., University Park, PA (United States)
Pennsylvania State Univ., University Park, PA (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
Pennsylvania State Univ., University Park, PA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Technische Univ. Kaiserslautern (Germany). Research Center OPTIMAS
Technische Univ. Kaiserslautern (Germany). Research Center OPTIMAS; Fraunhofer Inst. for Industrial Mathematics ITWM, Kaiserslautern (Germany)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; US Office of Naval Research (ONR); German Research Foundation (DFG)

Grant/Contract Number:: NA0003525

OSTI ID:: 1841983

Report Number(s):: SAND--2022-0498J; 702559

Journal Information:: Laser & Photonics Reviews, Journal Name: Laser & Photonics Reviews Journal Issue: 1 Vol. 16; ISSN 1863-8880

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Observation of Quadratic (Charge-2) Weyl Point Splitting in Near-Infrared Photonic Crystals

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