Pairing from strong repulsion in triangular lattice Hubbard model
Superconductivity
2018-04-25 v2 Quantum Gases
Strongly Correlated Electrons
Abstract
We propose a paring 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 a second hole. The effective interaction between these three-body bound states is repulsive, implying that this pairing mechanism is relevant for superconductivity.
Cite
@article{arxiv.1711.03233,
title = {Pairing from strong repulsion in triangular lattice Hubbard model},
author = {Shang-Shun Zhang and Wei Zhu and Cristian D. Batista},
journal= {arXiv preprint arXiv:1711.03233},
year = {2018}
}