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SUMMARY:Different charge density waves in emergent kagome materials - Heng
 xin Tan\, Weizmann Institute of Science\, Rehovot\, Israel
DTSTART:20231016T133000Z
DTEND:20231016T140000Z
UID:TALK207256@talks.cam.ac.uk
CONTACT:Kang Wang
DESCRIPTION:Kagome materials with corner-shared triangular sublattices are
  fascinating because of their unique \ncrystal and electronic structures. 
 In this talk\, I will first introduce the charge density wave (CDW) orders
  \nin the intriguing kagome metals AV3Sb5 (A = K\, Rb\, Cs)\, where the va
 n Hove singularity-related Fermi \nsurface nesting mechanism is believed t
 o be critical for the formation of CDW. I will further show that \nour rec
 ent experiment demonstrates that the phonon softening and electron-phonon 
 coupling \nmechanism is also essential. Then\, I will introduce different 
 CDW orders in a newly discovered kagome \nmetal ScV6Sn6\, and propose a gr
 ound-state CDW\, which\, different from the initial observation\, is\nappr
 oved immediately by experiments. Unlike CDWs in AV3Sb5\, CDWs in ScV6Sn6 a
 re induced purely \nby the phonon softening mechanism despite the appearan
 ce of two van Hove singularities close to the \nFermi level. I will summar
 ize the similarities and differences between these two types of kagome met
 als.\nFinally\, if time permits\, I will show our most recent predictions 
 on the unexpected surface charge orders \nin kagome series RX6Sn6 (R=rare 
 earth elements\, X = V\, Mn) due to the surface phonon-spin interaction.
LOCATION:Zoom link: https://zoom.us/j/92447982065?pwd=RkhaYkM5VTZPZ3pYSHpt
 UXlRSkppQT09
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