Physical Review B, volume 54, issue 7, pages 4843-4856
Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states.
Publication type: Journal Article
Publication date: 1996-08-15
Journal:
Physical Review B
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3.7
ISSN: 24699950, 24699969, 10980121, 1550235X
Abstract
We present a theoretical analysis of the band-edge exciton structure in nanometer-size crystallites of direct semiconductors with a cubic lattice structure or a hexagonal lattice structure which can be described within the framework of a quasicubic model. The lowest energy exciton, eightfold degenerate in spherically symmetric dots, is split into five levels by the crystal shape asymmetry, the intrinsic crystal field (in hexagonal lattice structures), and the electron-hole exchange interaction. Transition oscillator strengths and the size dependence of the splittings have been calculated. Two of the five states, including the ground state, are optically passive (dark excitons). The oscillator strengths of the other three levels (bright excitons) depend strongly on crystal size, shape, and energy band parameters. The relative ordering of the energy levels is also heavily influenced by these parameters. The distance between the first optically active state and the optically forbidden ground exciton state increases with decreasing size, leading to an increase of the Stokes shift in the luminescence. Our results are in good agreement with the size dependence of Stokes shifts obtained in fluorescence line narrowing and photoluminescence experiments in CdSe nanocrystals. Mixing of the dark and bright excitons in an external magnetic field allows the direct optical recombination of the dark exciton ground state. The observed shortening of the luminescence decay time in CdSe nanoncrystals in a magnetic field is also in excellent agreement with the theory, giving further support to the validity of our model. \textcopyright{} 1996 The American Physical Society.
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- We do not take into account publications without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Efros A. et al. Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states. // Physical Review B. 1996. Vol. 54. No. 7. pp. 4843-4856.
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Efros A., ROSEN M., Kuno M., Nirmal M., Norris D. C., Bawendi M. G. Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states. // Physical Review B. 1996. Vol. 54. No. 7. pp. 4843-4856.
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TY - JOUR
DO - 10.1103/PhysRevB.54.4843
UR - https://doi.org/10.1103/PhysRevB.54.4843
TI - Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states.
T2 - Physical Review B
AU - Efros, A.L.
AU - ROSEN, M.
AU - Kuno, Masaru
AU - Nirmal, M.
AU - Norris, David C.
AU - Bawendi, Moungi G.
PY - 1996
DA - 1996/08/15 00:00:00
PB - American Physical Society (APS)
SP - 4843-4856
IS - 7
VL - 54
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
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@article{1996_Efros,
author = {A.L. Efros and M. ROSEN and Masaru Kuno and M. Nirmal and David C. Norris and Moungi G. Bawendi},
title = {Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states.},
journal = {Physical Review B},
year = {1996},
volume = {54},
publisher = {American Physical Society (APS)},
month = {aug},
url = {https://doi.org/10.1103/PhysRevB.54.4843},
number = {7},
pages = {4843--4856},
doi = {10.1103/PhysRevB.54.4843}
}
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Efros, A.L., et al. “Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states..” Physical Review B, vol. 54, no. 7, Aug. 1996, pp. 4843-4856. https://doi.org/10.1103/PhysRevB.54.4843.
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