Emission from Mesoscopic-Size Islands Formed in a GaAs/AlAs Double Layer Structure

Wysmołek, A.; Chwalisz, B.; Potemski, M.; Stępniewski, R.; Babiński, A.; Raymond, S.; Thierry‐Mieg, V.

doi:10.12693/aphyspola.106.367

Cited by 9 publications

(11 citation statements)

References 25 publications

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“…This is expected since the eh exchange interaction inuences neither the initial (where the two majority carriers are forming closed shell with J e = 0) nor the nal state (only one carrier left). It has been previously reported that the X + emission is not observed and the X − is clearly observed in non-resonant excitation regime [9], due to the very long lifetime of the indirect excitons at the type-II GaAs/AlAs bilayer [14]. In a quasi-resonant excitation regime, the emission related to the negatively charged exciton (X − ) has also been observed and identied, based on the particular shape of the QD conning potential, signicantly deeper for electrons than for holes [11].…”

Section: Resultsmentioning

confidence: 96%

Intershell Exchange Interaction in Charged GaAlAs Quantum Dots

et al. 2013

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Optical anisotropy of charged excitons and biexcitons related to the single-particle sand p-shell emission in GaAlAs/AlAs quantum dots is investigated. The polarization-dependence and time-resolved micro-photoluminescence measurements were performed. Cross-correlation measurements were used to identify the ladder of excitonic states and allowed us to show two cascade pathways, including the spin singlet and triplet states of charged excitons and biexcitons. The ne structure of the studied states is described and analysed in terms of electronelectron, holehole, and electronhole exchange interactions.

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Section: Resultsmentioning

confidence: 96%

Intershell Exchange Interaction in Charged GaAlAs Quantum Dots

et al. 2013

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“…The sample under study consists of a type II GaAs/ AlAs double quantum well structure [4,5] (see inset in Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

Fine Structure of Neutral Excitons in Single GaAlAs Quantum Dots

et al. 2012

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Optical anisotropy of neutral excitons in GaAlAs/AlAs quantum dots is investigated. Low-temperature polarization-sensitive photoluminescence measurements of single quantum dots are performed. It is found that neutral excitons (X) in the quantum dots exhibit a ne structure splitting. The ne structure splitting ranges from 10 µeV to 100 µeV and correlates with the X energy. The polarization axis of the ne structure splitting is well oriented along [110] crystallographic direction of a substrate. The orientation is attributed to the elongation of GaAlAs/AlAs quantum dots in the [110] direction of the substrate.

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“…These dots show remarkably low surface density, at the level of 10 5 − 10 6 cm −2 . Their emission spectra are dispersed in a wide energy range, 1.56-1.68 eV, [14][15][16][17][18][19][20] due to the spread in the lateral extent of the confining potential.…”

Section: Sample and Experimental Setupsmentioning

confidence: 99%

Energy spectrum of confined positively charged excitons in single quantum dots

Molas¹,

Wójs²,

Nicolet³

et al. 2016

Phys. Rev. B

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A theoretical model, which relates the binding energy of a positively charged exciton in a quantum dot with the confinement energy is presented. It is shown that the binding energy, defined as the energy difference between the corresponding charged and neutral complexes confined on the same excitonic shell strongly depends on the shell index. Moreover, it is shown that the ratio of the binding energy for positively charged excitons from the p-and s-shells of a dot depends mainly on the nearly perfect confinement in the dot, which is due to the "hidden symmetry" of the multielectron-hole system. We applied the theory to the excitons confined to a single GaAlAs/AlAs quantum dots. The relevant binding energy was determined using the micro-photoluminescence and micro-photoluminescence excitation magneto-spectroscopy. We show that within our theory, the confinement energy determined using the ratio of the binding energy corresponds well to the actual confinement energy of the investigated dot.

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Emission from Mesoscopic-Size Islands Formed in a GaAs/AlAs Double Layer Structure

Cited by 9 publications

References 25 publications

Intershell Exchange Interaction in Charged GaAlAs Quantum Dots

Intershell Exchange Interaction in Charged GaAlAs Quantum Dots

Fine Structure of Neutral Excitons in Single GaAlAs Quantum Dots

Energy spectrum of confined positively charged excitons in single quantum dots

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