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

Interlayer van der Waals (vdW) coupling is generic in two-dimensionalmaterials such as graphene and transition metal dichalcogenides, which caninduce very low-energy phonon modes. Using high-resolution inelastic hard x-rayscattering, we uncover the ultra-low energy phonon mode along the Cu-O bonddirection in the high-$T_c$ cuprate (Bi,Pb)$_2$(Sr,La)$_2$CuO$_{6+\delta}$(Bi2201). This mode is independent of temperature, while its intensitydecreases with doping in accordance with an increasing c-axis latticeparameter. We compare the experimental results to first-principles densityfunctional theory simulations and identify the observed mode as a van der Waalsphonon, which arises from the shear motion of the adjacent Bi-O layers. Thisshows that Bi-based cuprate has similar vibrational properties as graphene andtransition metal dichalcogenides, which can be exploited to engineer novelheterostructures.

Observation of van der Waals phonons in the single-layer cuprate (Bi,Pb)$_2$(Sr,La)$_2$CuO$_{6+\delta}$