Fig. 1: The temperature–hole concentration (T − n) phase diagram of the 2D three-orbital SSH model inferred from our results.

We observe charge-density-wave (CDW), superconducting (SC), and polaronic metal phases. The solid square and triangular symbols indicate the transition temperatures estimated for the CDW and SC phases (see main text). The open circles indicate all points where explicit DQMC calculations were performed. Here, we have scaled temperature axis by a factor of 4.5 to be consistent with the phase diagram of BKBO26.