Spectroscopic signatures of biexcitons: A case study in Ruddlesden-Popper lead-halides
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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_ | 1866912490154098688 |
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| author | Koch, Katherine A. Rojas-Gatjens, Esteban Gomez-Dominguez, Martin Correa-Baena, Juan-Pablo Silva-Acuna, Carlos Kandada, Ajay Ram Srimath |
| author_facet | Koch, Katherine A. Rojas-Gatjens, Esteban Gomez-Dominguez, Martin Correa-Baena, Juan-Pablo Silva-Acuna, Carlos Kandada, Ajay Ram Srimath |
| contents | Exciton-exciton interactions are fundamental to the light-emitting properties of semiconductors, influencing applications from lasers to quantum light sources. In this study, we investigate the spectroscopic signatures and binding energy of biexcitons in a metal halide two-dimensional Ruddlesden-Popper structure, which is known for hosting distinct excitonic resonances with unique lattice coupling. Using three spectroscopic techniques - photoluminescence (PL) and two variations of two-dimensional electronic spectroscopy (2DES) - we map coherent one-quantum and two-quantum correlations to gain deeper insight into the biexciton characteristics. While PL spectroscopy is hindered by spectral broadening and reabsorption, 2DES provides a more accurate characterization, revealing multiple biexciton states and uncovering a mixed biexciton species arising from exciton cross-coupling. These findings highlight the importance of advanced spectroscopic approaches in accurately determining biexciton binding energies and offer new perspectives on many-body interactions in exciton-polarons within layered perovskites. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_11890 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spectroscopic signatures of biexcitons: A case study in Ruddlesden-Popper lead-halides Koch, Katherine A. Rojas-Gatjens, Esteban Gomez-Dominguez, Martin Correa-Baena, Juan-Pablo Silva-Acuna, Carlos Kandada, Ajay Ram Srimath Materials Science Exciton-exciton interactions are fundamental to the light-emitting properties of semiconductors, influencing applications from lasers to quantum light sources. In this study, we investigate the spectroscopic signatures and binding energy of biexcitons in a metal halide two-dimensional Ruddlesden-Popper structure, which is known for hosting distinct excitonic resonances with unique lattice coupling. Using three spectroscopic techniques - photoluminescence (PL) and two variations of two-dimensional electronic spectroscopy (2DES) - we map coherent one-quantum and two-quantum correlations to gain deeper insight into the biexciton characteristics. While PL spectroscopy is hindered by spectral broadening and reabsorption, 2DES provides a more accurate characterization, revealing multiple biexciton states and uncovering a mixed biexciton species arising from exciton cross-coupling. These findings highlight the importance of advanced spectroscopic approaches in accurately determining biexciton binding energies and offer new perspectives on many-body interactions in exciton-polarons within layered perovskites. |
| title | Spectroscopic signatures of biexcitons: A case study in Ruddlesden-Popper lead-halides |
| topic | Materials Science |
| url | https://arxiv.org/abs/2503.11890 |