Photoinduced excitonic magnetism in a multiorbital Hubbard system
Strongly Correlated Electrons
2026-02-10 v1
Abstract
Multiorbital Hubbard models with Hund coupling and crystal-field splitting exhibit an instability toward spin-triplet excitonic order in the parameter regime characterized by strong local spin fluctuations. Upon chemical doping, two distinct types of excitonic ferromagnetism have been reported. Using steady-state nonequilibrium dynamical mean-field theory, we demonstrate that photo-doped half-filled systems can host nonthermal counterparts of these excitonic phases and exhibit a rich phase diagram in the space of photo-doping and crystal field splitting. Photo-doping a spin-triplet excitonic insulator provides a route towards nonequilibrium control of magnetic order.
Cite
@article{arxiv.2510.27483,
title = {Photoinduced excitonic magnetism in a multiorbital Hubbard system},
author = {Lei Geng and Sujay Ray and Philipp Werner},
journal= {arXiv preprint arXiv:2510.27483},
year = {2026}
}