Quantification of Exciton Fine Structure Splitting in a Two-Dimensional Perovskite Compound
| Autor: | Katarzyna Posmyk, Natalia Zawadzka, Mateusz Dyksik, Alessandro Surrente, Duncan K. Maude, Tomasz Kazimierczuk, Adam Babiński, Maciej R. Molas, Watcharaphol Paritmongkol, Mirosław Mączka, William A. Tisdale, Paulina Płochocka, Michał Baranowski |
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| Přispěvatelé: | Wroclaw University of Science and Technology, Faculty of Physics [Warsaw] (FUW), University of Warsaw (UW), Laboratoire national des champs magnétiques intenses - Toulouse (LNCMI-T), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Massachusetts Institute of Technology (MIT), Polish Academy of Sciences (PAN), ANR-17-EURE-0009,NanoX,Science et Ingénierie à l'Echelle Nano(2017) |
| Rok vydání: | 2022 |
| Předmět: |
high magnetic field
Energy Metal halide perovskites high magnetic field 2D perovskites Crystal structure Polarization Magnetic properties Excitons General Materials Science [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] Metal halide perovskites 2D perovskites Physical and Theoretical Chemistry |
| Zdroj: | Journal of Physical Chemistry Letters Journal of Physical Chemistry Letters, 2022, 13 (20), pp.4463-4469. ⟨10.1021/acs.jpclett.2c00942⟩ |
| ISSN: | 1948-7185 |
| Popis: | International audience; Applications of two-dimensional (2D) perovskites have significantly outpaced the understanding of many fundamental aspects of their photophysics. The optical response of 2D lead halide perovskites is dominated by strongly bound excitonic states. However, a comprehensive experimental verification of the exciton fine structure splitting and associated transition symmetries remains elusive. Here we employ low temperature magneto-optical spectroscopy to reveal the exciton fine structure of (PEA)2PbI4 (here PEA is phenylethylammonium) single crystals. We observe two orthogonally polarized bright in-plane free exciton (FX) states, both accompanied by a manifold of phonon-dressed states that preserve the polarization of the corresponding FX state. Introducing a magnetic field perpendicular to the 2D plane, we resolve the lowest energy dark exciton state, which although theoretically predicted, has systematically escaped experimental observation (in Faraday configuration) until now. These results corroborate standard multiband, effective-mass theories for the exciton fine structure in 2D perovskites and provide valuable quantification of the fine structure splitting in (PEA)2PbI4. |
| Databáze: | OpenAIRE |
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