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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2305.08345 |
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| _version_ | 1866909224887386112 |
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| author | Xuan, Fengyuan Lai, MingRui Wu, Yaze Quek, Su Ying |
| author_facet | Xuan, Fengyuan Lai, MingRui Wu, Yaze Quek, Su Ying |
| contents | 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$_2$, clearly demonstrating the relevance of excitons in the nonlinear response. A strong double-exciton resonance in 2D NbOCl$_2$ leads to giant enhancement in the second order susceptibility. Our work paves the way for the realization of efficient ultrathin quantum light sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_08345 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Exciton-Enhanced Spontaneous Parametric Down-Conversion in Two-Dimensional Crystals Xuan, Fengyuan Lai, MingRui Wu, Yaze Quek, Su Ying Computational Physics Materials Science 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$_2$, clearly demonstrating the relevance of excitons in the nonlinear response. A strong double-exciton resonance in 2D NbOCl$_2$ leads to giant enhancement in the second order susceptibility. Our work paves the way for the realization of efficient ultrathin quantum light sources. |
| title | Exciton-Enhanced Spontaneous Parametric Down-Conversion in Two-Dimensional Crystals |
| topic | Computational Physics Materials Science |
| url | https://arxiv.org/abs/2305.08345 |