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Hyperfine interactions and slow spin dynamics in quasi-isotropic InP-based core/shell colloidal nanocrystals

(2019) ACS NANO. 13(9). p.10201-10209
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Abstract
Colloidal InP core nanocrystals are taking over CdSe-based nanocrystals, notably in optoelectronic applications. Despite their use in commercial devices, such as display screens, the optical properties of InP nanocrystals and especially their relation to the exciton fine structures remain poorly understood. In this work, we show that the ensemble magneto-optical properties of InP-based core/shell nanocrystals investigated in strong magnetic fields up to 30 T are strikingly different from other colloidal nanostructures. Notably, the mixing of the lowest spin-forbidden dark exciton state with the nearest spin-allowed bright state does not occur up to the highest magnetic fields applied. This lack of mixing in an ensemble of nanocrystals suggests an anisotropy tolerance of InP nanocrystals. This striking property allowed us to unveil the slow spin dynamics between Zeeman sublevels (up to 400 ns at 15 T). Furthermore, we show that the unexpected magnetic-field-induced lengthening of the dark exciton lifetime results from the hyperfine interaction between the spin of the electron in the dark exciton with the nuclear magnetic moments. Our results demonstrate the richness of the spin physics in InP quantum dots and stress the large potential of InP nanostructures for spin-based applications.
Keywords
colloidal nanostructure, III-V, hyperfine interaction, dark exciton, high magnetic field, EXCITON FINE-STRUCTURE, BAND-EDGE EXCITON, QUANTUM DOTS, RECOMBINATION DYNAMICS, MAGNETIC POLARON, HIGH-EFFICIENCY, DARK, SPECTROSCOPY

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MLA
Brodu, Annalisa, et al. “Hyperfine Interactions and Slow Spin Dynamics in Quasi-Isotropic InP-Based Core/Shell Colloidal Nanocrystals.” ACS NANO, vol. 13, no. 9, 2019, pp. 10201–09.
APA
Brodu, A., Tessier, M., Canneson, D., Dupont, D., Ballottin, M. V., Christianen, P. C., … Biadala, L. (2019). Hyperfine interactions and slow spin dynamics in quasi-isotropic InP-based core/shell colloidal nanocrystals. ACS NANO, 13(9), 10201–10209.
Chicago author-date
Brodu, Annalisa, Mickaël Tessier, Damien Canneson, Dorian Dupont, Mariana V Ballottin, Peter CM Christianen, Celso de Mello Donega, et al. 2019. “Hyperfine Interactions and Slow Spin Dynamics in Quasi-Isotropic InP-Based Core/Shell Colloidal Nanocrystals.” ACS NANO 13 (9): 10201–9.
Chicago author-date (all authors)
Brodu, Annalisa, Mickaël Tessier, Damien Canneson, Dorian Dupont, Mariana V Ballottin, Peter CM Christianen, Celso de Mello Donega, Zeger Hens, Dmitri R Yakovlev, Manfred Bayer, Daniel Vanmaekelbergh, and Louis Biadala. 2019. “Hyperfine Interactions and Slow Spin Dynamics in Quasi-Isotropic InP-Based Core/Shell Colloidal Nanocrystals.” ACS NANO 13 (9): 10201–10209.
Vancouver
1.
Brodu A, Tessier M, Canneson D, Dupont D, Ballottin MV, Christianen PC, et al. Hyperfine interactions and slow spin dynamics in quasi-isotropic InP-based core/shell colloidal nanocrystals. ACS NANO. 2019;13(9):10201–9.
IEEE
[1]
A. Brodu et al., “Hyperfine interactions and slow spin dynamics in quasi-isotropic InP-based core/shell colloidal nanocrystals,” ACS NANO, vol. 13, no. 9, pp. 10201–10209, 2019.
@article{8637738,
  abstract     = {Colloidal InP core nanocrystals are taking over CdSe-based nanocrystals, notably in optoelectronic applications. Despite their use in commercial devices, such as display screens, the optical properties of InP nanocrystals and especially their relation to the exciton fine structures remain poorly understood. In this work, we show that the ensemble magneto-optical properties of InP-based core/shell nanocrystals investigated in strong magnetic fields up to 30 T are strikingly different from other colloidal nanostructures. Notably, the mixing of the lowest spin-forbidden dark exciton state with the nearest spin-allowed bright state does not occur up to the highest magnetic fields applied. This lack of mixing in an ensemble of nanocrystals suggests an anisotropy tolerance of InP nanocrystals. This striking property allowed us to unveil the slow spin dynamics between Zeeman sublevels (up to 400 ns at 15 T). Furthermore, we show that the unexpected magnetic-field-induced lengthening of the dark exciton lifetime results from the hyperfine interaction between the spin of the electron in the dark exciton with the nuclear magnetic moments. Our results demonstrate the richness of the spin physics in InP quantum dots and stress the large potential of InP nanostructures for spin-based applications.},
  author       = {Brodu, Annalisa and Tessier, Mickaël and Canneson, Damien and Dupont, Dorian and Ballottin, Mariana V and Christianen, Peter CM and de Mello Donega, Celso and Hens, Zeger and Yakovlev, Dmitri R and Bayer, Manfred and Vanmaekelbergh, Daniel and Biadala, Louis},
  issn         = {1936-0851},
  journal      = {ACS NANO},
  keywords     = {colloidal nanostructure,III-V,hyperfine interaction,dark exciton,high magnetic field,EXCITON FINE-STRUCTURE,BAND-EDGE EXCITON,QUANTUM DOTS,RECOMBINATION DYNAMICS,MAGNETIC POLARON,HIGH-EFFICIENCY,DARK,SPECTROSCOPY},
  language     = {eng},
  number       = {9},
  pages        = {10201--10209},
  title        = {Hyperfine interactions and slow spin dynamics in quasi-isotropic InP-based core/shell colloidal nanocrystals},
  url          = {http://dx.doi.org/10.1021/acsnano.9b03384},
  volume       = {13},
  year         = {2019},
}

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