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CATEGORIES:Lennard-Jones Centre
SUMMARY:Different charge density waves in emergent kagome 
 materials - Hengxin Tan\, Weizmann Institute of Sc
 ience\, Rehovot\, Israel
DTSTART;TZID=Europe/London:20231016T143000
DTEND;TZID=Europe/London:20231016T150000
UID:TALK207256AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/207256
DESCRIPTION:Kagome materials with corner-shared triangular sub
 lattices are fascinating because of their unique \
 ncrystal and electronic structures. In this talk\,
  I will first introduce the charge density wave (C
 DW) orders \nin the intriguing kagome metals AV3Sb
 5 (A = K\, Rb\, Cs)\, where the van Hove singulari
 ty-related Fermi \nsurface nesting mechanism is be
 lieved to be critical for the formation of CDW. I 
 will further show that \nour recent experiment dem
 onstrates that the phonon softening and electron-p
 honon coupling \nmechanism is also essential. Then
 \, I will introduce different CDW orders in a newl
 y discovered kagome \nmetal ScV6Sn6\, and propose 
 a ground-state CDW\, which\, different from the in
 itial observation\, is\napproved immediately by ex
 periments. Unlike CDWs in AV3Sb5\, CDWs in ScV6Sn6
  are induced purely \nby the phonon softening mech
 anism despite the appearance of two van Hove singu
 larities close to the \nFermi level. I will summar
 ize the similarities and differences between these
  two types of kagome metals.\nFinally\, if time pe
 rmits\, 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=RkhaY
 kM5VTZPZ3pYSHptUXlRSkppQT09
CONTACT:Kang Wang
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