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research article

Anomalous and Chern topological waves in hyperbolic networks

Chen. Qiaolu
•
Zhang, Zhe  
•
Qin, Haoye  
Show more
March 14, 2024
Nature Communications

Hyperbolic lattices are a new type of synthetic materials based on regular tessellations in non-Euclidean spaces with constant negative curvature. While so far, there has been several theoretical investigations of hyperbolic topological media, experimental work has been limited to time-reversal invariant systems made of coupled discrete resonances, leaving the more interesting case of robust, unidirectional edge wave transport completely unobserved. Here, we report a non-reciprocal hyperbolic network that exhibits both Chern and anomalous chiral edge modes, and implement it on a planar microwave platform. We experimentally evidence the unidirectional character of the topological edge modes by direct field mapping. We demonstrate the topological origin of these hyperbolic chiral edge modes by an explicit topological invariant measurement, performed from external probes. Our work extends the reach of topological wave physics by allowing for backscattering-immune transport in materials with synthetic non-Euclidean behavior.

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Type
research article
DOI
10.1038/s41467-024-46551-x
Author(s)
Chen. Qiaolu
Zhang, Zhe  
Qin, Haoye  
Bossart, Aleksi Antoine  
Yang, Yihao
Chen, Hongsheng
Fleury, Romain  
Date Issued

2024-03-14

Publisher

Nature Research

Published in
Nature Communications
Volume

15

Article Number

2293

Subjects

Topological insulators

•

hyperbolic space

•

Scattering networks

•

network models

•

Floquet topological insulator

•

Anomalous Floquet insulator

•

microwaves

•

non reciprocity

URL

submitted manuscript preprint

https://doi.org/10.21203/rs.3.rs-3286219/v1
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LWE  
FunderGrant Number

Swiss federal funding

MB22.00028

FNS

181232

RelationURL/DOI

IsSupplementedBy

https://zenodo.org/records/10409107
Available on Infoscience
March 14, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/206102
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