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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In an effective medium description of acoustic metamaterials, the Williscoupling plays the same role as the bianisotropy in electromagnetism. Willismedia can be described by a constitutive matrix composed of the classicaleffective bulk modulus and density and additional cross-coupling terms definingthe acoustic bianisotropy. Based on an unifying theoretical model, we unite theproperties of acoustic Willis coupling with $\mathcal{PT}$ symmetric systemsunder the same umbrella and show in either case that an exceptional point hostsa remarkably pronounced scattering asymmetry that is accompanied by one-wayzero reflection for sound waves. The analytical treatment is backed up byexperimental input in asymmetrically side-loaded wavesguides showing how gaugetransformations and loss biasing can embrace both Willis materials andnon-Hermitian physics to tailor unidirectional reflectionless acoustics, whichis appealing for purposeful sound insulation and steering.

Unidirectional zero sonic reflection in passive $\mathcal{PT}$ symmetric Willis media