Exciton fine structure in CdSe nanoplatelets using a quasi-2D screened configuration-interaction framework
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| Format: | Preprint |
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2026
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| _version_ | 1866908826172653568 |
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| author | Patra, Sumanti Bester, Gabriel |
| author_facet | Patra, Sumanti Bester, Gabriel |
| contents | We compute exciton binding energies and fine-structure splittings in CdSe nanoplatelets with two zincblende geometries and one wurtzite geometry, finding that the wurtzite structure exhibits the largest bright-bright splitting due to its intrinsic in-plane anisotropy, while the zincblende structures show smaller but finite splittings arising from atomistic symmetry breaking at edges and corners. These results are obtained using a theoretical framework that we developed, which combines DFT single-particle states with screened configuration interaction, a quasi-2D dielectric screening model, and an efficient Coulomb-cutoff scheme that eliminates periodic-image interactions and enables accurate Coulomb and exchange integrals at low computational cost. This methodology provides a transferable and practical route for studying excitons in CdSe nanoplatelets and other quasi-two-dimensional nanomaterials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_09844 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Exciton fine structure in CdSe nanoplatelets using a quasi-2D screened configuration-interaction framework Patra, Sumanti Bester, Gabriel Materials Science We compute exciton binding energies and fine-structure splittings in CdSe nanoplatelets with two zincblende geometries and one wurtzite geometry, finding that the wurtzite structure exhibits the largest bright-bright splitting due to its intrinsic in-plane anisotropy, while the zincblende structures show smaller but finite splittings arising from atomistic symmetry breaking at edges and corners. These results are obtained using a theoretical framework that we developed, which combines DFT single-particle states with screened configuration interaction, a quasi-2D dielectric screening model, and an efficient Coulomb-cutoff scheme that eliminates periodic-image interactions and enables accurate Coulomb and exchange integrals at low computational cost. This methodology provides a transferable and practical route for studying excitons in CdSe nanoplatelets and other quasi-two-dimensional nanomaterials. |
| title | Exciton fine structure in CdSe nanoplatelets using a quasi-2D screened configuration-interaction framework |
| topic | Materials Science |
| url | https://arxiv.org/abs/2602.09844 |