We study the effect of geometric constraints on the formation of indirect excitonic complexes with excess charge by considering the problem of two identical electrons moving in half-space subject to mutual Coulomb repulsion and the Coulomb attraction to a heavy hole of charge Z residing on a flat impenetrable surface. We find that Z=1 is the critical charge necessary for binding, as compared to Zc≈0.911 in the unconstrained system. This suggests that interlayer electron--hole systems may serve as a flexible and experimentally accessible platform to study electronic behavior close to the critical nuclear charge necessary for binding.
@article{arxiv.2401.06017,
title = {Simulating critical anion chemistry with indirect excitons},
author = {Krzysztof Myśliwy and Krzysztof Jachymski},
journal= {arXiv preprint arXiv:2401.06017},
year = {2024}
}