Theoretical approaches to Fröhlich excitonic polarons in polar semiconductors
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912645286723584 |
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| author | Even, Jacky Thebaud, Simon Kshirsagar, Aseem Rajan Xu, Zeli Pedesseau, Laurent Zacharias, Marios Katan, Claudine |
| author_facet | Even, Jacky Thebaud, Simon Kshirsagar, Aseem Rajan Xu, Zeli Pedesseau, Laurent Zacharias, Marios Katan, Claudine |
| contents | Short abstract: The paper reviews the physics of Fröhlich excitonic polarons from the viewpoint of empirical approaches with some original developments. Models for excitonic polarons in ionic semiconductors in the spirit of the Lee Low and Pines (LLP) model for free polarons were initiated by Toyozawa and Hermanson and extended by Pollman and Buttner (PB). The dominant electron-hole interaction with the lattice introduced by Frohlich is represented by a long-range effective interaction with a single longitudinal optical polar mode. The properties of the excitonic polarons are characterized by various physical quantities such as effective dielectric constants, effective masses, virtual phonon populations, carrier self-energies and binding energies, and effective electron-hole interactions mediated by the lattice. In 3D perovskites, the excitonic polarons deviate from the simplified picture of weakly interacting (almost free) polarons, with sizeable effects of electron-hole correlations on all the physical properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_07406 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Theoretical approaches to Fröhlich excitonic polarons in polar semiconductors Even, Jacky Thebaud, Simon Kshirsagar, Aseem Rajan Xu, Zeli Pedesseau, Laurent Zacharias, Marios Katan, Claudine Materials Science Short abstract: The paper reviews the physics of Fröhlich excitonic polarons from the viewpoint of empirical approaches with some original developments. Models for excitonic polarons in ionic semiconductors in the spirit of the Lee Low and Pines (LLP) model for free polarons were initiated by Toyozawa and Hermanson and extended by Pollman and Buttner (PB). The dominant electron-hole interaction with the lattice introduced by Frohlich is represented by a long-range effective interaction with a single longitudinal optical polar mode. The properties of the excitonic polarons are characterized by various physical quantities such as effective dielectric constants, effective masses, virtual phonon populations, carrier self-energies and binding energies, and effective electron-hole interactions mediated by the lattice. In 3D perovskites, the excitonic polarons deviate from the simplified picture of weakly interacting (almost free) polarons, with sizeable effects of electron-hole correlations on all the physical properties. |
| title | Theoretical approaches to Fröhlich excitonic polarons in polar semiconductors |
| topic | Materials Science |
| url | https://arxiv.org/abs/2505.07406 |