Internal dynamics and dielectric screening of confined multiexciton states
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866918092715589632 |
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| author | Planelles, Josep Climente, Juan I. Movilla, Jose L. |
| author_facet | Planelles, Josep Climente, Juan I. Movilla, Jose L. |
| contents | Recent experimental and computational studies suggest that biexcitons (BX) confined in large CsPbBr$_3$ nanocrystals experience reduced dielectric screening as compared to excitons (X) and trions (X$^*$). Here we provide a physical rationale to explain such a behavior. A characteristic frequency is introduced, which describes the internal dynamics of an exciton within the excitonic complex. By means of effective mass--variational Quantum Monte Carlo simulations, we show that, in large nanocrystals, the frequency is similar for X and X$^*$, but smaller for BX. Because the frequencies exceed that of the bulk longitudinal optical phonon, this leads to a reduced dielectric constant for BX, which is in contrast with the behavior of strongly confined nanocrystals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_11087 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Internal dynamics and dielectric screening of confined multiexciton states Planelles, Josep Climente, Juan I. Movilla, Jose L. Mesoscale and Nanoscale Physics Recent experimental and computational studies suggest that biexcitons (BX) confined in large CsPbBr$_3$ nanocrystals experience reduced dielectric screening as compared to excitons (X) and trions (X$^*$). Here we provide a physical rationale to explain such a behavior. A characteristic frequency is introduced, which describes the internal dynamics of an exciton within the excitonic complex. By means of effective mass--variational Quantum Monte Carlo simulations, we show that, in large nanocrystals, the frequency is similar for X and X$^*$, but smaller for BX. Because the frequencies exceed that of the bulk longitudinal optical phonon, this leads to a reduced dielectric constant for BX, which is in contrast with the behavior of strongly confined nanocrystals. |
| title | Internal dynamics and dielectric screening of confined multiexciton states |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.11087 |