Bound and anti-bound biexciton in site-controlled pyramidal GaInAs/GaAs quantum dots

Jarlov, C.; Gallo, Pascal; Calic, M.; Dwir, B.; Rudra, A.; Kapon, E.

doi:10.1063/1.4765646

Cited by 21 publications

(14 citation statements)

References 32 publications

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“…We have shown, both experimentally and theoretically, different FWM creation pathways, and their polarization selection rules. The results are promising for the application of heterodyne spectral interferometry to a large range of QD systems, like site-controlled QDs [51][52][53][54] or QD molecules [55,56] and-in a broader context-other individual optical transitions in solid state.…”

Section: Discussionmentioning

confidence: 99%

Vectorial nonlinear coherent response of a strongly confined exciton–biexciton system

et al. 2013

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The vectorial four-wave mixing response of an individual strongly confined exciton-biexciton system with fine-structure splitting in a GaAs/AlGaAs quantum dot is measured by dual-polarization heterodyne spectral interferometry. The results are compared with theoretical predictions based on the optical Bloch equations. The system is described by a fourlevel scheme, which is a model system of the nonlinear excitonic response in low-dimensional semiconductors. We measure its coherence properties and determine the underlying dephasing mechanisms. An impact of the inhomogeneous broadening by spectral wandering on the coherent response is investigated. We further discuss the different four-wave mixing pathways, polarization selection rules, the time-resolved polarization state, the vectorial response in two-dimensional four-wave mixing and ensemble properties.

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Section: Discussionmentioning

confidence: 99%

Vectorial nonlinear coherent response of a strongly confined exciton–biexciton system

et al. 2013

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“…The role of morphological details as size and shape, composition profile, on the electronic states (and confinement potential) has been addressed both experimentally and theoretically on numerous kind of III-V material systems [33][34][35][36][37][38] , including also InAs on InP 28,30 but for only slightly asymmetric structures. For example, the importance of correlations, when the size of the nanostructure increases, has been deduced by observing biexciton binding energy increase due to smaller separation between excited hole states.…”

Section: Introductionmentioning

confidence: 99%

Excitonic fine structure and binding energies of excitonic complexes in single InAs quantum dashes

et al. 2016

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The fundamental electronic and optical properties of elongated InAs nanostructures embedded in quaternary InGaAlAs barrier are investigated by means of high-resolution optical spectroscopy and many-body atomistic tight-binding theory. These wire-like shaped self-assembled nanostructures are known as quantum dashes and are typically formed during the molecular beam epitaxial growth on InP substrates. In this work we study properties of excitonic complexes confined in quantum dashes emitting in a broad spectral range from below 1.2 to 1.55 m. We find peculiar trends for the biexciton and negative trion binding energies, with pronounced trion

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“…This competing mechanism is not possible for a binary barrier such a GaAs. Correlations with the emission energyX 10 have indeed been reported for the biexciton and negative trion binding energies in a recent study of pyramidal InGaAs QDs in pure GaAs barriers [46].…”

Section: Coulomb Energiesmentioning

confidence: 59%

Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking

et al. 2015

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High symmetry epitaxial quantum dots (QDs) with three or more symmetry planes provide a very promising route for the generation of entangled photons for quantum information applications. The great challenge to fabricate nanoscopic high symmetry QDs is further complicated by the lack of structural characterization techniques able to resolve small symmetry breaking. In this work, we present an approach for identifying and analyzing the signatures of symmetry breaking in the optical spectra of QDs. Exciton complexes in InGaAs/AlGaAs QDs grown along the [111]B crystalline axis in inverted tetrahedral pyramids are studied by polarization resolved photoluminescence spectroscopy combined with lattice temperature dependence, excitation power dependence and temporal photon correlation measurements. By combining such a systematic experimental approach with a simple theoretical approach based on a point-group symmetry analysis of the polarized emission patterns of each exciton complex, we demonstrate that it is possible to achieve a strict and coherent identification of all the observable spectral patterns of numerous exciton complexes and a quantitative determination of the fine structure splittings of their quantum states. This analysis is found to be particularly powerful for selecting QDs with the highest degree of symmetry (C 3v and D h 3 ) for potential applications of these QDs as polarization entangled photon sources. We exhibit the optical spectra when evolving towards asymmetrical QDs, and show the higher sensitivity of certain exciton complexes to symmetry breaking.

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Bound and anti-bound biexciton in site-controlled pyramidal GaInAs/GaAs quantum dots

Cited by 21 publications

References 32 publications

Vectorial nonlinear coherent response of a strongly confined exciton–biexciton system

Vectorial nonlinear coherent response of a strongly confined exciton–biexciton system

Excitonic fine structure and binding energies of excitonic complexes in single InAs quantum dashes

Spectral signatures of high-symmetry quantum dots and effects of symmetry breaking

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