Investigating Electronic Structures of AV₃Sb₅ KagomeMetal family

Kagome metals have recently attracted attention due to their fascinating electronic structures. Because of their unique three sublattice geometry and depending on the degree of electron filling, these materials are predicted to host a variety of instabilities like superconductivity (SC), spin liquid states, and charge density waves (CDW). One nonmagnetic kagome family of interest is AV₃Sb₅ (A = K, Rb, Cs). This family of layered metals exhibits CDW, unconventional superconductivity, and non-trivial band topology due to multiple saddle points near the Fermi level. To aid in understanding this material class, we computationally studied the band structure and Fermi surface of these families and applied the Lindhard susceptibility calculations to study the degree of Fermi surface nesting. Additionally, we experimentally and computationally explore the coupling between CDW and SC states by hole doping the systems. The resulting phase diagrams for AV₃Sb_5−xSn_x reveal that small amounts of carrier doping can have dramatic impacts on SC and CDW order in these systems.