Pairing from strong repulsion in triangular lattice Hubbard model
Shang-Shun Zhang, Wei Kang Zhu, Cristian D. Batista
We propose a pairing mechanism between holes in the dilute limit of doped frustrated Mott insulators. Hole pairing arises from a hole-hole-magnon three-body bound state. This pairing mechanism has its roots on single-hole kinetic energy frustration, which favors antiferromagnetic (AFM) correlations around the hole. We demonstrate that the AFM polaron (hole-magnon bound state) produced by a single hole propagating on a field-induced polarized background is strong enough to bind a second hole. The effective interaction between these three-body bound states is repulsive, implying that this pairing mechanism is relevant for superconductivity.
arXiv:1711.03233•Physical review. B./Physical review. B•Apr 20, 2018•42 citations