We demonstrate the existence of an unconventional pairing state in photodoped Mott insulators on ladder and quasi-two-dimensional geometries, characterized by quasi-long-range doublon-holon correlations that signal Mott exciton condensation. The doublon-holon pairing exhibits correlations of d-wave-like symmetry, reminiscent of superconducting pairing in chemically doped Mott insulators. By constructing the phase diagram, using density matrix renormalization group, we reveal that the doublon-holon pairing state in the photodoped ladder emerges between the spin-singlet, charge-density-wave, and η-pairing phases. Our study suggests that the interplay of charge, spin, and η-spin degrees of freedom can give rise to exotic quantum many-body states in photodoped Mott insulators.
@article{arxiv.2504.03324,
title = {Doublon-Holon Pairing State in Photodoped Mott Insulators},
author = {Ryota Ueda and Madhumita Sarkar and Zala Lenarčič and Denis Golež and Kazuhiko Kuroki and Tatsuya Kaneko},
journal= {arXiv preprint arXiv:2504.03324},
year = {2026}
}