Trion photoluminescence and trion stability in atomically thin semiconductors
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866913231567585280 |
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| author | Perea-Causin, Raul Brem, Samuel Schmidt, Ole Malic, Ermin |
| author_facet | Perea-Causin, Raul Brem, Samuel Schmidt, Ole Malic, Ermin |
| contents | The optical response of doped monolayer semiconductors is governed by trions, i.e. photoexcited electron-hole pairs bound to doping charges. While their photoluminescence (PL) signatures have been identified in experiments, a microscopic model consistently capturing bright and dark trion peaks is still lacking. In this work, we derive a generalized trion PL formula on a quantum-mechanical footing, considering direct and phonon-assisted recombination mechanisms. We show the trion energy landscape in WSe$_2$ by solving the trion Schrödinger equation. We reveal that the mass imbalance between equal charges results in less stable trions exhibiting a small binding energy and, interestingly, a large energetic offset from exciton peaks in PL spectra. Furthermore, we compute the temperature-dependent PL spectra for n- and p-doped monolayers and predict yet unobserved signatures originating from trions with an electron at the $Λ$ point. Our work presents an important step towards a microscopic understanding of the internal structure of trions determining their stability and optical fingerprint. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_10812 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Trion photoluminescence and trion stability in atomically thin semiconductors Perea-Causin, Raul Brem, Samuel Schmidt, Ole Malic, Ermin Mesoscale and Nanoscale Physics The optical response of doped monolayer semiconductors is governed by trions, i.e. photoexcited electron-hole pairs bound to doping charges. While their photoluminescence (PL) signatures have been identified in experiments, a microscopic model consistently capturing bright and dark trion peaks is still lacking. In this work, we derive a generalized trion PL formula on a quantum-mechanical footing, considering direct and phonon-assisted recombination mechanisms. We show the trion energy landscape in WSe$_2$ by solving the trion Schrödinger equation. We reveal that the mass imbalance between equal charges results in less stable trions exhibiting a small binding energy and, interestingly, a large energetic offset from exciton peaks in PL spectra. Furthermore, we compute the temperature-dependent PL spectra for n- and p-doped monolayers and predict yet unobserved signatures originating from trions with an electron at the $Λ$ point. Our work presents an important step towards a microscopic understanding of the internal structure of trions determining their stability and optical fingerprint. |
| title | Trion photoluminescence and trion stability in atomically thin semiconductors |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2306.10812 |