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Showing 1 to 8 of 8 for “"semiconductor quantum wells"”.
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Electronic and optical properties of semiconductor quantum wells
… electronic and optical properties of GaAs-AlGaAs semiconductors quantum wells. The light and heavy hole subbands are strongly hybridized and this subband mixing has important effects on electronic and optical properties. A systematic study of the mixing effects on valence subband structure, …
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Carrier excitations and nonlinear optical effects in semiconductor quantum wells
… investigate the nonlinear optical properties of semiconductor quantum-well devices. The generation of terahertz electromagnetic pulses from ultrafast optical pulse excitations of semiconductor heterostructures is studied in the time domain with a three-level model. Coupled optical Bloch equations …
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Theoretical studies of the optoelectronic properties of semiconductor quantum wells
The valence-band structure of a semiconductor quantum well is calculated based on the multiband effective-mass theory. A unitary transformation is found to diagonalize the six-by-six Luttinger-Kohn Hamiltonian into two three-by-three blocks, making the computation more efficient. With this new …
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Theory of the optical properties of III-V semiconductor quantum wells
… the electronic and optical properties of III-V semiconductor quantum wells, specifically those based on the GaAs-AlGaAs system. Both the linear and non-linear optical properties of these systems are considered. A theoretical model for the refractive index in GaAs-AlGaAs quantum well structures …
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Coherence in nanostructured excitons
… nanostructures: supramolecular J-aggregates and semiconductor quantum wells. In J-aggregate thin films I determined that coherence is controlled by thermal dephasing rather than film inhomogeneities, even at cryogenic temperatures. Tubular J-aggregates in solution undergo morphological …
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I. Excitonic phase diagram in Si: evidence for two condensed phases ; II. Motion of photoexcited carriers in GaAs/Alx̳Ga1̳-̳x̳As multiple quantum wells : anomalous confinement at high densities
… carriers in bulk and two-dimensional semiconductors. Two major topics are addressed: I. Excitonic Phase Diagram in Si: Evidence for Two Condensed Phases At low temperatures and sufficient densities, free excitons in Si and Ge undergo a simultaneous gas-liquid and insulator-metal …
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Θεωρητική μελέτη μη-γραμμικών οπτικών διαδικασιών σε ημιαγώγιμα κβαντικά πηγάδια
Στην εργασία αυτή, μελετάμε, τόσο με αναλυτικό όσο και με υπολογιστικό τρόπο, γραμμικά και μη γραμμικά οπτικά φαινόμενα σε συστήματα ημιαγώγιμων κβαντικών πηγαδιών GaAs/AlGaAs δύο ενεργειακών υποζωνών, όπου επάγονται διαϋποζωνικές μεταβάσεις, υπό την επίδραση ηλεκτρομαγνητικών πεδίων. Στο πρώτο …