Slow Hot-Exciton Cooling and Enhanced Interparticle Excitonic Coupling in HgTe Quantum Dots

Fan, Kezhou; Sergeeva, Kseniia A.; Sergeev, Aleksandr A.; Zhang, Lu; Chan, Christopher C. S.; Li, Zhuo; Zhong, Xiaoyan; Kershaw, Stephen V.; Liu, Junwei; Rogach, Andrey L.; Wong, Kam Sing

doi:10.1021/acsnano.4c05061

ACS Nano

2024

DOI: 10.1021/acsnano.4c05061

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Slow Hot-Exciton Cooling and Enhanced Interparticle Excitonic Coupling in HgTe Quantum Dots

Kezhou Fan,

Kseniia A. Sergeeva,

Aleksandr A. Sergeev

et al.

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Ultrafast Electron Dynamics in Coupled and Uncoupled HgTe Quantum Dots

Mizrahi,

Weis,

Péronne

et al. 2024

J. Phys. Chem. Lett.

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In this article, we study electron dynamics in HgTe quantum dots with a 1.9 μm gap, a material relevant for infrared sensing and emission, using ultrafast spectroscopy with 35 fs time resolution. Experiments have been carried out at several probing photon energies around the gap, which allows us to follow the relaxation path of the photoexcited electrons. We compare such dynamics in two kind of samples, HgTe quantum dots with long ligands and with short ligands, in order to distinguish the role of the coupling between adjacent quantum dots. Three main dynamics can be observed in the transient reflectivity on both samples, with slightly different relaxation times: two fast decays on the time scale of hundreds of femtoseconds and a few picoseconds, respectively, followed by a slower relaxation back to the unperturbed value over hundreds of picoseconds. The two fast components are associated with intraband relaxation of the photoexcited electrons within the conduction band, while the final relaxation path can be assigned to Auger relaxation mechanisms and to the slower interband exciton recombination.

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Ultrafast Electron Dynamics in Coupled and Uncoupled HgTe Quantum Dots

Mizrahi,

Weis,

Péronne

et al. 2024

J. Phys. Chem. Lett.

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show abstract

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Slow Hot-Exciton Cooling and Enhanced Interparticle Excitonic Coupling in HgTe Quantum Dots

Cited by 1 publication

References 54 publications

Ultrafast Electron Dynamics in Coupled and Uncoupled HgTe Quantum Dots

Ultrafast Electron Dynamics in Coupled and Uncoupled HgTe Quantum Dots

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