Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"Quantum Rings"”.
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Characterization of type-II GaSb quantum rings in GaAs solar cells
… through the solar cell. Type II GaSb/GaAs quantum rings (QRs) can significantly extend the spectral response beyond the visible out towards 1.4 µm giving a near optimum band gap for concentrator solar cell applications. Also, in type II band alignment the electrons are weakly localized and …
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The Study of Coupling in InGaAs Quantum Rings Grown by Droplet Epitaxy
… of InAs/GaAs nanostructures which result in twin quantum dots (QD) formed on a single quantum ring (QR). Previous studies have investigated the coupling between vertically grown quantum dot pairs. In this thesis, we have used photoluminescence (PL) and photoluminescence excitation (PLE) to examine …
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Path integral Monte Carlo simulations and their relation to recent advances in nanophysics
… on the application of PIMC to nanoscopic quantum dots and quantum rings. In the case of quantum dots, shell effects and electron correlations for up to 12 electrons are studied. Furthermore, the addition energies are qualitatively reproduced using PIMC. In nanoscopic quantum rings, a …
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Enhancing the Light output of Solid State Emitters
… studied are III-V based type-II emitting quantum dots/quantum rings (QDs/QR’s), which emit at telecom wavelengths either in the O-band (GaSb/GaAs QRs) or the C-band (InAs/GaAs QDs capped with GaAsSb). Individual exciton emission at low temperature was observed in these samples using …
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Passivation of GaAs surfaces and fabrication of self-assembled In(Ga)As/GaAs quantum ring structures
… on GaAs and transformation of InAs islands into quantum rings (QRs). All the samples are fabricated by metalorganic vapor phase epitaxy and characterized by optical spectroscopy and atomic force microscopy. InGaAs/GaAs near-surface quantum well (NSQW) structures were used in the GaAs surface …
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The Use of Synchrotron Radiation to study Overgrowth Phenomena in InAs/GaAs Nanostructures
… ((1)) Free-standing and buried InGaAs quantum dots: Free-standing In(x)Ga(1-x)As islands grown on GaAs (001) by molecular beam epitaxy (MBE) with a nominal concentration of x=0.5 have been investigated. Contrast variation close to the K edge of As by anomalous GID at the (200) …