In-plane mapping of buried InGaAs quantum rings and hybridization effects on the electronic structure

Teodoro, M. D.; Malachias, A.; Lopes-Oliveira, V.; Cesar, D. F.; López‐Richard, V.; Marques, G. E.; Marega, E.; Benamara, Mourad; Mazur, Yu. I.; Salamo, G. J.

doi:10.1063/1.4733964

Cited by 13 publications

(8 citation statements)

References 42 publications

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“…The lateral size of the QRs, as described in Ref. [23], compared to the QDs, will also lead to a shrinkage of the emission energy.…”

Section: Structural Characterizationmentioning

confidence: 99%

“…The in-plane potential profile used for both the QD and QR shape simulations is given by [23] as illustrated in Fig. 4(a).…”

Section: Electronic Structurementioning

confidence: 99%

“…4(a). The parameters a 1 and a 2 are used to define the effective radius and width of the lateral confinement [23]. The corresponding material parameters of the ternary alloy, In x Ga 1−x As, were obtained by linear interpolation of the GaAs and the InAs values reported in Ref.…”

Section: Electronic Structurementioning

confidence: 99%

“…(1) can be expanded on the basis set, ψ (e/ h) n,m,l (r,θ,z), of wave functions for δ = 0, as described in Ref. [23],…”

Section: Electronic Structurementioning

confidence: 99%

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Structural and magnetic confinement of holes in the spin-polarized emission of coupled quantum ring–quantum dot chains

et al. 2014

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The optical analysis of multilayer structures formed from the topmost layer of InGaAs/GaAs quantum rings (QRs) grown on a vertically stacked and laterally aligned InGaAs/GaAs quantum dot (QD) superlattice has been performed to elucidate the nature of the contribution from each layer. These hybrid structures representing a coupled QR chain layer and the layers of self-assembled QD chains display strong optical anisotropy. Unusually strong oscillations are observed in the circularly polarized photoluminescence (PL) intensities under magnetic field for emissions in the spectral range of the QD structure and these oscillations occur simultaneously with weaker oscillations related to the Aharonov-Bohm interference that modulates the emissions from the QR top layer of the structure. The behavior seen in the magneto-PL spectrum is interpreted in terms of joint effects associated to strain, spatial, and magnetic field confinements on the valence band states forming the magnetoexciton ground state of this multilayered structure. The result can be ascribed to a magnetically induced dark exciton contribution where the heavy-hole (type II) state becomes localized outside, whereas light-hole (type I) as well as electron states remain inside the spatial confinement area of the QD.

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“…The lateral size of the QRs, as described in Ref. [23], compared to the QDs, will also lead to a shrinkage of the emission energy.…”

Section: Structural Characterizationmentioning

confidence: 99%

“…The in-plane potential profile used for both the QD and QR shape simulations is given by [23] as illustrated in Fig. 4(a).…”

Section: Electronic Structurementioning

confidence: 99%

Section: Electronic Structurementioning

confidence: 99%

“…(1) can be expanded on the basis set, ψ (e/ h) n,m,l (r,θ,z), of wave functions for δ = 0, as described in Ref. [23],…”

Section: Electronic Structurementioning

confidence: 99%

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Structural and magnetic confinement of holes in the spin-polarized emission of coupled quantum ring–quantum dot chains

et al. 2014

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“…4(c) and a relaxed is the bulk lattice parameter obtained from Vegard's law for the given EuTe/SnTe concentration of Fig 4(d). Although these maps do not provide the three-dimensional composition profile of EuTe dots, they can be used to infer information about electronic properties of our nanostructures as well as quantum confinement in similar QDs [24].…”

Section: Eute Islands On Sntementioning

confidence: 99%

Resonant X-ray diffraction of self-assembled epitaxial systems: From direct to complementary chemical information

Coelho

Díaz

Magalhães-Paniago

et al. 2012

Eur. Phys. J. Spec. Top.

Self Cite

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Abstract. In this work we depict schematically the use of resonant (anomalous) X-ray diffraction as a tool to directly probe strain and composition of self-assembled semiconductor islands. By employing a direct analysis at the Eu L 3 edge its composition gradient is quantified for EuTe:SnTe capped islands. Projection maps are proposed to visualize the results, providing an alternative capability to infer quantum dot properties. A more complex methodology is applied to the study of InP:GaAs islands, in which complementary anomalous measurements are performed. For this system the number of samples analyzed allows us to extract the activation energy for Ga adatoms diffusion from the substrate to the islands.

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Aharonov-Bohm Effect for Neutral Excitons in Quantum Rings

Teodoro¹,

Campo²,

López‐Richard³

et al. 2018

Physics of Quantum Rings

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In-plane mapping of buried InGaAs quantum rings and hybridization effects on the electronic structure

Cited by 13 publications

References 42 publications

Structural and magnetic confinement of holes in the spin-polarized emission of coupled quantum ring–quantum dot chains

Structural and magnetic confinement of holes in the spin-polarized emission of coupled quantum ring–quantum dot chains

Resonant X-ray diffraction of self-assembled epitaxial systems: From direct to complementary chemical information

Aharonov-Bohm Effect for Neutral Excitons in Quantum Rings

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