We report variational and diffusion quantum Monte Carlo calculations of the binding energies of indirect trions and biexcitons in ideal two-dimensional bilayer systems within the effective-mass approximation, and with a Coulomb 1/r interaction between charge carriers. The critical layer separation at which trions become unbound has been studied for various electron-hole mass ratios, and found to be over an order of magnitude larger than the critical layer separation for biexcitons.
@article{arxiv.1707.09427,
title = {Stability of trions in coupled quantum wells modelled by two-dimensional bilayers},
author = {O. Witham and R. J. Hunt and N. D. Drummond},
journal= {arXiv preprint arXiv:1707.09427},
year = {2018}
}