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PreprintarXiv licencearXiv

Band-Saddle-Point Engineering in Mixed A-site AV3Sb5 Kagome Metals

  • Maxim Wenzel
  • Alexander A. Tsirlin
  • Andrea N. Capa Salinas
  • Brenden R. Ortiz
  • Stephen D. Wilson
  • Ece Uykur
  • Martin Dressel
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Abstract

AV3Sb5 compounds (A = K, Rb, Cs) offer an experimental platform for probing the physics of kagome metals near ideal Van Hove filling. Here, we use optical spectroscopy on AV3Sb5 with mixed A-site compositions to reveal the effect of the alkali metal on the low-energy electronic structure. Supported by density-functional-theory calculations, we identify a band-saddle-point inversion as a chemical consequence of Cs substitution, revealing that A-site composition controls the orbital character of Van Hove singularities, Fermi surface topology, and electron-phonon interactions while leaving the kagome layer intact.

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Cite

BibTeXRIS
BibTeX
@misc{wenzel2026bandsaddlepoint,
  title = {{Band-Saddle-Point Engineering in Mixed $A$-site $A$V$_3$Sb$_5$ Kagome Metals}},
  author = {Maxim Wenzel and Alexander A. Tsirlin and Andrea N. Capa Salinas and Brenden R. Ortiz and Stephen D. Wilson and Ece Uykur and Martin Dressel},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.15196},
  eprint = {2609.15196},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.15196},
}
RIS
TY  - UNPB
TI  - Band-Saddle-Point Engineering in Mixed A-site AV_3Sb_5 Kagome Metals
AU  - Maxim Wenzel
AU  - Alexander A. Tsirlin
AU  - Andrea N. Capa Salinas
AU  - Brenden R. Ortiz
AU  - Stephen D. Wilson
AU  - Ece Uykur
AU  - Martin Dressel
PY  - 2026
DA  - 2026/09/14
PB  - arXiv
DO  - 10.48550/arxiv.2609.15196
UR  - https://arxiv.org/abs/2609.15196
AB  - AV_3Sb_5 compounds (A = K, Rb, Cs) offer an experimental platform for probing the physics of kagome metals near ideal Van Hove filling. Here, we use optical spectroscopy on AV_3Sb_5 with mixed A-site compositions to reveal the effect of the alkali metal on the low-energy electronic structure. Supported by density-functional-theory calculations, we identify a band-saddle-point inversion as a chemical consequence of Cs substitution, revealing that A-site composition controls the orbital character of Van Hove singularities, Fermi surface topology, and electron-phonon interactions while leaving the kagome layer intact.
ER  -