English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Topological physics opens a door towards flexible routing and resilientlocalization of waves of various nature. Recently proposed higher-ordertopological insulators provide advanced control over wave localization in thestructures of different dimensionality. In many cases, the formation of suchhigher-order topological phases is governed by the lattice symmetries, withkagome and breathing honeycomb lattices being prominent examples. Here, wedesign and experimentally realize the resonant electric circuit with $D_4$symmetry and additional next-nearest-neighbor couplings. As we prove, acoupling of the distant neighbors gives rise to an in-gap corner state.Retrieving the associated invariant directly from the experiment, wedemonstrate the topological nature of the designed system, revealing the roleof long-range interactions in the formation of topological phases. Our resultsthus highlight the distinctions between tight-binding systems and theirphotonic counterparts with long-range couplings.

Higher-order topological states mediated by long-range coupling in $D_4$-symmetric lattices