Doping effects of Kagome superconductor <i>A</i>V₃Sb₅ (<i>A</i> = K, Rb, Cs)

Abstract

Material with Kagome lattice provides an excellent platform for studying electronic correlation effects, topological states of matter, unconventional superconductivity, and geometric frustration. The recently discovered Kagome superconductors <i>A</i>V₃Sb₅ (<i>A</i> = K, Rb, Cs) have attracted widespread attention in the field of condensed matter physics, and many efforts have been made to elucidate their novel physical properties, such as charge density wave, unconventional superconductivity, and band topology. Meanwhile, many groups have effectively tuned these novel properties through chemical doping, offering a good opportunity for further understanding the materials of this system. In this paper, we comprehensively review the latest research progress of the doping effect of this rapidly developed <i>A</i>V₃Sb₅ system, with the objective of further promoting the in-depth research into Kagome superconductor. Specifically, we review the chemical doping in CsV₃Sb₅ with elements such as Nb, Ta, Ti, and Sn, and the surface doping with elements Cs or O as well, and describe their influences on the novel quantum properties, especially superconductivity, charge density wave, and electronic band structure of the material. Furthermore, the intricate physical mechanism of doping manipulation is discussed, in order to provide a basic knowledge for further understanding and studying the rich quantum effects of the system, such as charge density waves, time reversal symmetry breaking, and superconductivity.