Exciton-Enhanced Spontaneous Parametric Down-Conversion in Two-Dimensional Crystals
Computational Physics
2024-06-18 v3 Materials Science
Abstract
We show that excitonic resonances and interexciton transitions can enhance the probability of spontaneous parametric down-conversion, a second-order optical response which generates entangled photon pairs. We benchmark our ab initio many-body calculations using experimental polar plots of second harmonic generation in NbOI, clearly demonstrating the relevance of excitons in the nonlinear response. A strong double-exciton resonance in 2D NbOCl leads to giant enhancement in the second order susceptibility. Our work paves the way for the realization of efficient ultrathin quantum light sources.
Keywords
Cite
@article{arxiv.2305.08345,
title = {Exciton-Enhanced Spontaneous Parametric Down-Conversion in Two-Dimensional Crystals},
author = {Fengyuan Xuan and MingRui Lai and Yaze Wu and Su Ying Quek},
journal= {arXiv preprint arXiv:2305.08345},
year = {2024}
}