Exciton Fine Structure in Lead Chalcogenide Quantum Dots: Valley Mixing and Crucial Role of Intervalley Electron-Hole Exchange.
Nano Lett
; 20(12): 8897-8902, 2020 Dec 09.
Article
en En
| MEDLINE
| ID: mdl-33170719
ABSTRACT
We study the exciton fine structure in quantum dots of multivalley lead chalcogenides. We demonstrate that intervalley electron-hole exchange interaction, ignored in previous studies, dramatically modifies the exciton fine structure and leads to appearance of the ultrabright valley-symmetric spin-triplet exciton state dominating interband optical absorption. Valley mixing leads to brightening of other symmetry-allowed spin-triplet states which dominate low-temperature photoluminescence.
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Colección:
01-internacional
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MEDLINE
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En
Revista:
Nano Lett
Año:
2020
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Article
País de afiliación:
Rusia