Giant Strain Response of Charge Modulation and Singularity in a Kagome Superconductor
arxiv(2024)
摘要
Tunable quantum materials hold great potential for applications. Of special
interest are materials in which small lattice strain induces giant electronic
responses. The kagome compounds AV3Sb5 (A = K, Rb, Cs) provide a testbed for
such singular electronic states. In this study, through angle-resolved
photoemission spectroscopy, we provide comprehensive spectroscopic measurements
of the giant responses induced by compressive and tensile strains on the
charge-density-wave (CDW) order parameter and high-order van Hove singularity
(HO-VHS) in CsV3Sb5. We observe a tripling of the CDW gap magnitudes with 1
strain, accompanied by the changes of both energy and mass of the saddle-point
fermions. Our results reveal an anticorrelation between the unconventional CDW
order parameter and the mass of a HO-VHS, and highlight the role of the latter
in the superconducting pairing. The giant electronic responses uncover a rich
strain tunability of the versatile kagome system in studying quantum interplays
under lattice perturbations.
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