Topological quadratic-node semimetal in a photonic microring lattice

Zihe Gao (), Haoqi Zhao, Tianwei Wu, Xilin Feng, Zhifeng Zhang, Xingdu Qiao, Ching-Kai Chiu () and Liang Feng ()
Additional contact information
Zihe Gao: University of Pennsylvania
Haoqi Zhao: University of Pennsylvania
Tianwei Wu: University of Pennsylvania
Xilin Feng: University of Pennsylvania
Zhifeng Zhang: University of Pennsylvania
Xingdu Qiao: University of Pennsylvania
Ching-Kai Chiu: RIKEN Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), Wako
Liang Feng: University of Pennsylvania

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Graphene, with its two linearly dispersing Dirac points with opposite windings, is the minimal topological nodal configuration in the hexagonal Brillouin zone. Topological semimetals with higher-order nodes beyond the Dirac points have recently attracted considerable interest due to their rich chiral physics and their potential for the design of next-generation integrated devices. Here we report the experimental realization of the topological semimetal with quadratic nodes in a photonic microring lattice. Our structure hosts a robust second-order node at the center of the Brillouin zone and two Dirac points at the Brillouin zone boundary—the second minimal configuration, next to graphene, that satisfies the Nielsen–Ninomiya theorem. The symmetry-protected quadratic nodal point, together with the Dirac points, leads to the coexistence of massive and massless components in a hybrid chiral particle. This gives rise to unique transport properties, which we demonstrate by directly imaging simultaneous Klein and anti-Klein tunnelling in the microring lattice.

Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-023-38861-3 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38861-3

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-023-38861-3

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().