Cs V 3 Sb 5 : A Z 2 Topological Kagome Metal with a Superconducting Ground State

Recently discovered alongside its sister compounds KV_{3}Sb_{5} and RbV_{3}Sb_{5}, CsV_{3}Sb_{5} crystallizes with an ideal kagome network of vanadium and antimonene layers separated by alkali metal ions. This work presents the electronic properties of CsV_{3}Sb_{5}, demonstrating bulk superconductivity in single crystals with a T_{c}=2.5 K. The normal state electronic structure is studied via angle-resolved photoemission spectroscopy and density-functional theory, which categorize CsV_{3}Sb_{5} as a Z_{2} topological metal. Multiple protected Dirac crossings are predicted in close proximity to the Fermi level (E_{F}), and signatures of normal state correlation effects are also suggested by a high-temperature…

• NS
  National Science Foundation

  Awards: DGE-1650114, DMR-1906325
• UD
  U.S. Department of Energy

  Award: DE-AC02-06CH11357
• UO
  University of Science and Technology of China
• UO
  University of California, Santa Barbara

  Awards: CNS-1725797, DMR-1720256
• MR
  Materials Research Science and Engineering Center, Harvard University
• BN
  Brookhaven National Laboratory