Minimal model for the flat bands in copper-substituted lead phosphate apatite: Strong diamagnetism from multi-orbital physics

Omid Tavakol, Thomas Scaffidi

The claims that a copper-substituted lead apatite, denoted as CuPb${}_9$(PO${}_4$)${}_6$OH${}_2$, could be a room-temperature superconductor have led to an intense research activity. While…