Shell Filling and Paramagnetism in Few-Electron Colloidal Nanoplatelets

Llusar, Jordi; Climente, Juan I.

doi:10.1103/physrevlett.129.066404

Cited by 4 publications

(1 citation statement)

References 55 publications

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“…Various ultra-thin atomically flat quasi-two-dimensional semiconductor nanostructures with planar geometry, known as nanoplatelets (NPLs) are at the center of intense research in the last decade (see eg Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and references therein). Such close interest in these structures is because, on the one hand, semiconductor NPLs have the properties of semiconductor nanocrystals of the previous generation already widely used in electronics and optoelectronics -quantum dots (QDs), quantum wires (QWs), quantum films (QFs) and nanorods (NRs) [16], while, on the other hand, they exhibit several completely new unique properties that are absent not only in a bulk sample but also in the listed nanostructures of the previous generation.…”

Section: Introductionmentioning

confidence: 99%

Possibility of Exciton Bose-Condensation in Cdse Nanoplatelets

Baghdasaryan,

Harutyunyan,

Kazaryan

et al. 2023

Preprint

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The quasi-two-dimensional exciton subsystem in CdS nanoplatelets is considered. It is theoretically shown that Bose-Einstein condensation (BEC) of excitons is possible at a nonzero temperature in the approximation of an ideal Bose gas and in the presence of an “energy gap” between the ground and first excited states of two-dimensional exciton center of inertia of the translational motion. The condensation temperature (\({T_c}\)) increases with the width of the “gap” between the ground and the first excited levels of size quantization. It is shown that when the screening effect of free electrons and holes on bound excitons is considered, the BEC temperature of the exciton subsystem increases as compared to the case where this effect is absent. The energy spectrum of the exciton condensate in a CdS nanoplate is calculated within the framework of the weakly nonideal Bose gas approximation, considering the specifics of two-dimensional Born scattering.

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Section: Introductionmentioning

confidence: 99%

Possibility of Exciton Bose-Condensation in Cdse Nanoplatelets

Baghdasaryan,

Harutyunyan,

Kazaryan

et al. 2023

Preprint

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Lateral quantum confinement regulates charge carrier transfer and biexciton interaction in CdSe/CdSeS core/crown nanoplatelets

et al. 2023

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Two Biexciton Types Coexisting in Coupled Quantum Dot Molecules

et al. 2023

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Coupled colloidal quantum dot molecules (CQDMs) are an emerging class of nanomaterials, manifesting two coupled emission centers and thus introducing additional degrees of freedom for designing quantum-dot-based technologies. The properties of multiply excited states in these CQDMs are crucial to their performance as quantum light emitters, but they cannot be fully resolved by existing spectroscopic techniques. Here we study the characteristics of biexcitonic species, which represent a rich landscape of different configurations essentially categorized as either segregated or localized biexciton states. To this end, we introduce an extension of Heralded Spectroscopy to resolve the different biexciton species in the prototypical CdSe/CdS CQDM system. By comparing CQDMs with single quantum dots and with nonfused quantum dot pairs, we uncover the coexistence and interplay of two distinct biexciton species: A fast-decaying, strongly interacting biexciton species, analogous to biexcitons in single quantum dots, and a long-lived, weakly interacting species corresponding to two nearly independent excitons. The two biexciton types are consistent with numerical simulations, assigning the strongly interacting species to two excitons localized at one side of the quantum dot molecule and the weakly interacting species to excitons segregated to the two quantum dot molecule sides. This deeper understanding of multiply excited states in coupled quantum dot molecules can support the rational design of tunable single-or multiple-photon quantum emitters.

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Shell Filling and Paramagnetism in Few-Electron Colloidal Nanoplatelets

Cited by 4 publications

References 55 publications

Possibility of Exciton Bose-Condensation in Cdse Nanoplatelets

Possibility of Exciton Bose-Condensation in Cdse Nanoplatelets

Lateral quantum confinement regulates charge carrier transfer and biexciton interaction in CdSe/CdSeS core/crown nanoplatelets

Two Biexciton Types Coexisting in Coupled Quantum Dot Molecules

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