We show that the interplay of a high density two-dimensional electron gas and localized electrons in a neighboring Mott insulator leads to kinetic magnetism unique to the Mott/band insulator interface. Our study is based upon a bilayer Hubbard model at U=∞ with a potential difference between the two layers. We combine analytic results with DMRG simulations to show that magnetism, and especially ferromagnetism, is greatly enhanced relative by the proximity of the two subsystems. The results are potentially relevant to recent experiments suggesting magnetism in RTiO3/SrTiO3 heterostructures.
@article{arxiv.1509.02860,
title = {Kinetic Magnetism at the Interface Between Mott and Band Insulators},
author = {Jason Iaconis and Hiroaki Ishizuka and D. N. Sheng and Leon Balents},
journal= {arXiv preprint arXiv:1509.02860},
year = {2016}
}