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

Systems containing the ideal kagome lattice can exhibit several distinct andnovel exotic states of matter. One example of such systems is a recentlydiscovered $A$V$_{3}$Sb$_{5}$ ($A$ = K, Rb, and Cs) family of compounds. Here,the coexistence of the charge density wave (CDW) and superconductivity isobserved. In this paper, we study the dynamic properties of the$A$V$_{3}$Sb$_{5}$ systems in context of origin of the CDW phase. We show anddiscuss the structural phase transition from $P6/mmm$ to $C2/m$ symmetry thatare induced by the presence of phonon soft modes. We conclude that the CDWobserved in this family of compounds is a consequence of the atom displacement,from the high symmetry position of the kagome net, in low-temperature phase.Additionally, using the numerical {\it ab initio} methods, we discuss thecharge distribution on the $A$V$_{3}$Sb$_{5}$ surface. We show that theobserved experimental %$4\times 1$ stripe-like modulation of the surface, canbe related to surface reconstruction and manifestation of the three dimensional$2 \times 2 \times 2$ bulk CDW. Finally, the consequence of realization of the$C2/m$ structure on the electronic properties are discussed. We show that theelectronic band structure reconstruction and the accompanying modification ofdensity of states correspond well to the experimental data.

Dynamical Study of the Origin of the Charge Density Wave in $A$V$_{3}$Sb$_{5}$ ($A=$K, Rb, Cs) Compounds