Ground State Phase Diagram of the -- model
arXiv:2104.10149 · doi:10.1073/pnas.2109978118
Abstract
We report results of large scale ground state density matrix renormalization group(DMRG) calculations on -- cylinders with circumferences 6 and 8. We determine a rough phase diagram which appears to approximate the 2D system. While for many properties, positive and negative values () appear to correspond to electron and hole doped cuprate systems, respectively, the behavior of superconductivity itself shows an inconsistency between the model and the materials. The (hole doped) region shows antiferromagnetism limited to very low doping, stripes more generally, and the familiar Fermi-surface of the hole doped cuprates. However, we find strongly suppresses superconductivity. The (electron doped) region shows the expected circular Fermi pocket of holes around the point and a broad low-doped region of coexisting antiferromagnetism and -wave pairing with a strong triplet component at wave-vector induced by the antiferromagnetism and -wave pairing. The pairing for the electron low-doped system with is strong and unambiguous in the DMRG simulations. At larger doping another broad region with stripes in addition to weaker -wave pairing and striped -wave pairing appears. In a small doping region near for , we find a new type of stripe involving unpaired holes located predominantly on chains spaced three lattice spacings apart. The undoped two-leg ladder regions in between mimic the short-ranged spin correlations seen in two-leg Heisenberg ladders.
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