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

Quantum confinement is a restriction on the motion of electrons in a materialto specific region, resulting in discrete energy levels rather than continuousenergy bands. In certain materials quantum confinement could dramaticallyreshape the electronic structure and properties of the surface with respect tothe bulk. Here, in the recently discovered kagome superconductor CsV$_3$Sb$_5$(A=K, Rb, Cs) family of materials, we unveil the dominant role of quantumconfinement in determining their surface electronic structure. Combiningangle-resolved photoemission spectroscopy (ARPES) measurement anddensity-functional theory simulation, we report the observations oftwo-dimensional quantum well states due to the confinement of bulk electronpocket and Dirac cone to the nearly isolated surface layer. The theoreticalcalculations on the slab model also suggest that the ARPES observed spectra arealmost entirely contributed by the top two layers. Our results not only explainthe disagreement of band structures between the recent experiments andcalculations, but also suggest an equally important role played by quantumconfinement, together with strong correlation and band topology, in shaping theelectronic properties of this family of materials.

Emergence of Quantum Confinement in Topological Kagome Superconductor CsV$_3$Sb$_5$ family