Uniaxial strain tuning of charge modulation and singularity in a kagome superconductor

Abstract

Angle‑resolved photoemission spectroscopy (ARPES) reveals that ±1% uniaxial strain drastically modifies both the CDW gap (tripled magnitude) and the energy/mass of the van Hove singularity in CsV₃Sb₅. An anticorrelation between CDW order parameter and quasiparticle mass near the VHS is highlighted, suggesting the VHS’s central role in superconducting pairing. These findings introduce rich strain‑tunable electronic responses in kagome superconductors