Electronic nature of charge density wave and electron-phonon coupling in kagome superconductor KV3Sb5

Abstract The Kagome superconductors AV 3 Sb 5 (A = K, Rb, Cs) have received enormous attention due to their nontrivial topological electronic structure, anomalous physical properties and superconductivity. Unconventional charge density wave (CDW) has been detected in AV 3 Sb 5 . High-precision electronic structure determination is essential to understand its origin. Here we unveil electronic nature of the CDW phase in our high-resolution angle-resolved photoemission measurements on KV 3 Sb 5 . We have observed CDW-induced Fermi surface reconstruction and the associated band folding. The CDW-induced band splitting and the associated gap opening have been revealed at the boundary of the pristine and…

• NN
  National Natural Science Foundation of China

  Awards: U2032204, XDB33000000, 2016YFA0300300, 2018-01, 12074411, Y18G06, XDB28000000, 2018YFA0704200, 11922414, 11974404, 2017YFA0302900, 2017013, XDB25000000, 11888101
• CA
  Chinese Academy of Sciences

  Awards: 2018YFA0704200, XDB25000000, 11922414, 11888101, 2016YFA0300300, XDB33000000, Y18G06, 2017YFA0302900, 2017013, XDB28000000
• KC
  K. C. Wong Education Foundation

  Award: GJTD-2018-01
• NK
  National Key Research and Development Program of China

  Awards: 2016YFA0300602, XDB33000000, 2016YFA0300300, XDB25000000, XDB28000000, 2018YFA0305602, 2018YFA0704200, 2017013, 2017YFA0302900, 11888101, 11922414, 2017YFA0303100, Y18G06
• YI
  Youth Innovation Promotion Association

  Award: 2017013