Mahan excitons in room-temperature methylammonium lead bromide perovskites.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
12 Feb 2020
12 Feb 2020
Historique:
received:
28
04
2019
accepted:
21
01
2020
entrez:
14
2
2020
pubmed:
14
2
2020
medline:
14
2
2020
Statut:
epublish
Résumé
In a seminal paper, Mahan predicted that excitonic bound states can still exist in a semiconductor at electron-hole densities above the insulator-to-metal Mott transition. However, no clear evidence for this exotic quasiparticle, dubbed Mahan exciton, exists to date at room temperature. In this work, we combine ultrafast broadband optical spectroscopy and advanced many-body calculations to reveal that organic-inorganic lead-bromide perovskites host Mahan excitons at room temperature. Persistence of the Wannier exciton peak and the enhancement of the above-bandgap absorption are observed at all achievable photoexcitation densities, well above the Mott density. This is supported by the solution of the semiconductor Bloch equations, which confirms that no sharp transition between the insulating and conductive phase occurs. Our results demonstrate the robustness of the bound states in a regime where exciton dissociation is otherwise expected, and offer promising perspectives in fundamental physics and in room-temperature applications involving high densities of charge carriers.
Identifiants
pubmed: 32051405
doi: 10.1038/s41467-020-14683-5
pii: 10.1038/s41467-020-14683-5
pmc: PMC7016123
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
850Références
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