Multi-Dimensional Photon-Correlations Reveal Triexciton Features in Single Perovskite Quantum Dots
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911156490207232 |
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| author | Hinkle, Alex Tsao, Chieh Duell, Adam Utzat, Hendrik |
| author_facet | Hinkle, Alex Tsao, Chieh Duell, Adam Utzat, Hendrik |
| contents | Lead-halide perovskite quantum dots (PQDs) are established quantum emitters with potential for entangled photon-pair generation via multiexciton cascades. However, the energetics and dynamics of many-body excitations remain poorly understood. Here, we perform time- and frequency-resolved photon-correlation spectroscopy of single CsPbBr\textsubscript{3} PQDs at low temperatures using a single-photon avalanche diode (SPAD) array detector. We report biexciton binding energies and assign their charged states, which undergo fast ($μ$s) switching dynamics. Most notably, we identify a spectral feature blue-shifted from the exciton by $7.4 \pm 1.9$ meV as the bound triexciton and establish the order of its cascade emission. These results highlight the power of low-temperature, multidimensional photon-correlation spectroscopy for resolving complex many-body dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_12461 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multi-Dimensional Photon-Correlations Reveal Triexciton Features in Single Perovskite Quantum Dots Hinkle, Alex Tsao, Chieh Duell, Adam Utzat, Hendrik Materials Science Lead-halide perovskite quantum dots (PQDs) are established quantum emitters with potential for entangled photon-pair generation via multiexciton cascades. However, the energetics and dynamics of many-body excitations remain poorly understood. Here, we perform time- and frequency-resolved photon-correlation spectroscopy of single CsPbBr\textsubscript{3} PQDs at low temperatures using a single-photon avalanche diode (SPAD) array detector. We report biexciton binding energies and assign their charged states, which undergo fast ($μ$s) switching dynamics. Most notably, we identify a spectral feature blue-shifted from the exciton by $7.4 \pm 1.9$ meV as the bound triexciton and establish the order of its cascade emission. These results highlight the power of low-temperature, multidimensional photon-correlation spectroscopy for resolving complex many-body dynamics. |
| title | Multi-Dimensional Photon-Correlations Reveal Triexciton Features in Single Perovskite Quantum Dots |
| topic | Materials Science |
| url | https://arxiv.org/abs/2509.12461 |