We show that an interlayer exciton condensate doped into a strongly correlated Mott insulator exhibits a remarkable enhancement of the bandwidth of the magnetic excitations (triplons). This triplon is visible in the dynamical magnetic susceptibility and can be measured using resonant inelastic X-ray scattering. The bandwidth of the triplon scales with the exciton superfluid density, but only in the limit of strong correlations. As such the triplon bandwidth acts as a probe of exciton-spin interactions in the condensate.
@article{arxiv.1304.3643,
title = {Enhancement of spin propagation due to interlayer exciton condensation},
author = {Louk Rademaker and Jeroen van den Brink and Hans Hilgenkamp and Jan Zaanen},
journal= {arXiv preprint arXiv:1304.3643},
year = {2013}
}