Trions Stimulate Electronic Coupling in Colloidal Quantum Dot Molecules
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866915033719504896 |
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| author | Llusar, Jordi Climente, Juan I. |
| author_facet | Llusar, Jordi Climente, Juan I. |
| contents | Recent synthetic progress has enabled the controlled fusion of colloidal CdSe/CdS quantum dots in order to form dimers manifesting electronic coupling in their optical response. While this ``artificial H2 molecule'' constitutes a milestone towards the development of nanocrystal chemistry, the strength of the coupling has proven to be smaller than intended. The reason is that, when an exciton is photo-induced in the system, the hole localizes inside the CdSe cores and captures the electron, thus preventing its delocalization all over the dimer. Here, we predict, by means of k$\cdot$p theory and configuration interaction calculations, that using trions instead of neutral excitons or biexcitons restores the electron delocalization. Positive trions are particularly apt because the strong hole-hole repulsion makes electron delocalization robust against moderate asymmetries in the cores, thus keeping a homodimer-like behavior. Trion-charged colloidal quantum dot molecules have the potential to display quantum entanglement features at room temperature with existing technology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_06706 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Trions Stimulate Electronic Coupling in Colloidal Quantum Dot Molecules Llusar, Jordi Climente, Juan I. Mesoscale and Nanoscale Physics Recent synthetic progress has enabled the controlled fusion of colloidal CdSe/CdS quantum dots in order to form dimers manifesting electronic coupling in their optical response. While this ``artificial H2 molecule'' constitutes a milestone towards the development of nanocrystal chemistry, the strength of the coupling has proven to be smaller than intended. The reason is that, when an exciton is photo-induced in the system, the hole localizes inside the CdSe cores and captures the electron, thus preventing its delocalization all over the dimer. Here, we predict, by means of k$\cdot$p theory and configuration interaction calculations, that using trions instead of neutral excitons or biexcitons restores the electron delocalization. Positive trions are particularly apt because the strong hole-hole repulsion makes electron delocalization robust against moderate asymmetries in the cores, thus keeping a homodimer-like behavior. Trion-charged colloidal quantum dot molecules have the potential to display quantum entanglement features at room temperature with existing technology. |
| title | Trions Stimulate Electronic Coupling in Colloidal Quantum Dot Molecules |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2408.06706 |