Size dependence of polaronic effects on an exciton in a spherical quantum dot

Oshiro, Kazunori; Akai, Koji; Matsuura, M.

doi:10.1103/physrevb.59.10850

Cited by 40 publications

(21 citation statements)

References 22 publications

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“…Therefore, the high degree of confinement leads to vanishing of polaronic effects in the exciton state. The same conclusion has been reached by another group in their recent work [15] on size dependence of polaronic effects on an exciton in a quantum dot. Another quantity of interest is the oscillator strength, which is sensitively dependant on the confinement of the electron and hole wavefunctions and the overlap between them.…”

Section: Resultssupporting

confidence: 74%

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Polaronic exciton in a parabolic quantum dot

Senger

Bajaj

2003

Physica Status Solidi (b)

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A calculation of the variations of the energy and oscillator strength of the ground state of an exciton in an ionic quantum dot as a function of the dot size, using a parabolic confining potential and a variational approach, is presented. The strong exciton -phonon interaction is taken into account by using an effective potential between the electron and the hole as derived by Pollmann and Büttner. The values of the exciton binding energies calculated using this potential are compared with those obtained using statically screened Coulomb potential and are found to be considerably larger for all values of the quantum dot size. In small quantum dots, the electron -hole correlation is reduced as the single particle energies scale at a much faster rate than the interaction energy. This is manifested in the behavior of oscillator strength, which becomes less dependent on the form of the effective interaction as the quantum dot size is reduced.

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Section: Resultssupporting

confidence: 74%

“…This was contradicted in another work, which claims that polaronic effects in a donor like exciton should increase with decreasing dot size (for further discussion see Ref. [15] and the references cited therein). In view of these divergent conclusions, the problem of exciton-phonon interaction in a quantum dot deserves further attention.…”

Section: Introductionmentioning

confidence: 84%

Polaronic exciton in a parabolic quantum dot

Senger

Bajaj

2003

Physica Status Solidi (b)

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“…As for the red-shift, it could be attributed to electron-phonon coupling. Fundamentally, the electron-phonon coupling coefficients are proposed to increase with decreasing size of semiconductors [34]. In certain systems, electron-phonon coupling could be strong enough to overcome the spatial confinement to determine the energy of excitons.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal synthesis of prism-like mesocrystal CeO2

Chen

et al. 2009

Journal of Alloys and Compounds

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“…The size dependence of the exciton-LO-phonon interaction ͑Fröhlich interaction͒ in spherical QDs in glass is reported for GaAs and CdSe QDs. 34 A variational calculation showed monotonic reduction of the Fröhlich interaction by reducing the dot size. In addition, the calculation predicts that the coupling between electrons and holes will vanish when the dot radius tends to be zero since the charge distribution will become identical.…”

Section: Resultsmentioning

confidence: 99%

Longitudinal-optical-phonon-assisted energy relaxation in self-assembled CdS quantum dots embedded in ZnSe

Kumano

Yoshida

Tawara

et al. 2002

Journal of Applied Physics

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The energy relaxation processes of CdS self-assembled quantum dots ͑QDs͒ embedded in ZnSe were investigated. Longitudinal-optical ͑LO͒-phonon resonant structures were discerned in the photoluminescence spectra under the CdS selective excitation, especially under nearly resonant excitation conditions. Strong energy selectivity among the Gaussian distributed energy levels of the QDs are observed in energy relaxation processes, in which excitons are dominantly injected into the QDs whose ground state energies with respect to the excitation energy are equal to the multi-LO-phonon energy of ZnSe. Detection-energy dependent photoluminescence excitation ͑PLE͒ measurements also suggest that the coupling strength between the excitons and LO phonons is strongly size-dependent, i.e., coupling is strongly enhanced in smaller QDs. In addition, type-II band alignment of the CdS/ZnSe heterostructure is experimentally confirmed directly by PLE measurements.

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Size dependence of polaronic effects on an exciton in a spherical quantum dot

Cited by 40 publications

References 22 publications

Polaronic exciton in a parabolic quantum dot

Polaronic exciton in a parabolic quantum dot

Hydrothermal synthesis of prism-like mesocrystal CeO2

Longitudinal-optical-phonon-assisted energy relaxation in self-assembled CdS quantum dots embedded in ZnSe

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