A new class of topological kagome metals AV₃Sb₅ (A=K, Cs, Rb) with intertwined charge density wave order and superconductivity

Kagome metals are fascinating materials capable of hosting an interplay between topologically nontrivial electronic states and correlated electron phenomena. This interplay can arise from the Dirac points, flatbands, and saddle-points endemic to their band structures at select filling fractions. The discovery of a new class of kagome metals of the form AV₃Sb₅ with A=K, Cs, or Rb has recently provided a unique setting for exploring the interplay between Z2 electronic topology and intertwined charge density wave and superconducting orders. These quasi-two-dimensional compounds host a kagome net of nonmagnetic vanadium ions with an electron-filling that places the Fermi level near the saddle-points and their corresponding van Hove singularities. Nesting effects between these points are predicted to stabilize a variety of unusual states, ranging from orbital antiferromagnetism to unconventional superconductivity. Here I will present some of our recent work exploring the phase transitions and broken symmetries in these materials.