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Showing 1 to 20 of 47 for “"QUANTUM WIRES"”.
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Optical properties of semiconductor quantum wires
… and optical properties of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective bond-orbital model both of which fully account for the band mixing and material anisotropy. We also treat the structure geometry in detail taking …
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Optical properties of semiconductor quantum wires
… and optical properties of semiconductor quantum wires. For the subband structure, we employ multiband effective-mass theory and the effective bond-orbital model both of which fully account for the band mixing and material anisotropy. We also treat the structure geometry in detail taking …
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Electronic and Optical Properties of Self -Assembled Quantum Wires
… the excitonic absorption spectrum for the SILO quantum wires are investigated by using our envelope function model.
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Electronic and Optical Properties of Self-Assembled Quantum Wires
… band and optical properties of self-assembled quantum wires. In particular, the band structures and optical matrix elements of strained multiple quantumwires (QWR's) are investigated theoretically via the effective bond-orbital model(EBOM), which takes into account the effects of valence-band …
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Correlated dynamics of quantum wires and cigar shaped atomic gases
… with electron gas <br>techniques. <br> <br>In quantum wires we use thermodynamical relations to obtain <br>the plasmon and magnon velocities from the microscopic model <br>and find out that the ladder approximation (LA) to the <br>interaction vertex faithfully follows quantum Monte Carlo data …
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Temperature -Invariant Photoluminescence and Gain Spectra of Strained Gallium -Indium -Arsenide Quantum Wires
Using the Hakki-Paoli method, gain spectra at 77 and 300 K has been derived for a SILO grown GaInAs QWR Fabry-Perot laser diode. The wavelength-shift rate of the gain spectra is ∼1.4 A/°C. These temperature stabilized gain spectra make the QWRs applicable to long-wavelength VCSELs. The …
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Zigzag Phase Transition in Quantum Wires and Localization in the Inhomogeneous One-Dimensional Electron Gas
… is described by Luttinger Liquid theory. We use Quantum Monte Carlo methods to study two situations that are beyond Luttinger Liquid theory --- the quantum phase transition from a linear 1D electron system to a quasi-1D zigzag arrangement, and electron localization in quantum point contacts. …
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Optical Studies of Iii-V Quantum Wires Grown by Strain-Induced Lateral Ordering (Silo) Process
A characterization technique is developed to estimate the extent and shape of the spontaneously created composition modulation. The technique, based on resonant Raman spectroscopy, is general and can be utilized to map out composition regions in any semiconductor microstructure. Computer …
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Optical studies of III-V quantum wires grown by strain induced lateral ordering (SILO) process
… have been utilized to carefully study the quantum wires grown via strain induced lateral ordering (SILO) which is a bulk thermodynamics driven self-ordering process. Fourier transform photoluminescence (FTPL) measurements have been employed to study the polarization anisotropy in the …
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Surface Passivation of Colloidal II-IV Semiconductor Quantum Belts and Quantum Wires: Synthesis, Mechanism and Optical Studies
… aims to study the formation mechanism of CdSe quantum belts: QBs) and the surface passivation of CdTe quantum wires: QWs). Investigation of QB morphology and QW passivation are fundamentally important to avoid nonradiative recombination and to increase electron-transport efficiency in …
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Colloidal CdSe quantum nanowires: Synthesis, photo-induced photoluminescence enhancement and fabrication of core/shell, water-dispersible structures
… is applied to the growth of colloidal CdSe quantum wires. The synthetic conditions are optimized to control the morphology and optical properties of the quantum wires. The effects of the impurities of solvent TOPO during the synthesis were also explored. Photo-induced photoluminescence …
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The Effect Of Stationary UV Excitation On The Optical Behavior Of Electrochemically Self-Assembled Semiconductor Nanowires
… the optical response of the semiconductor quantum wire array when excited by stationary UV light. The array is synthesized by selectively electro-depositing the semiconductor material in electrochemically self-assembled porous alumina templates. Our studies are based on the optical …
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Wachstum und Charakterisierung von Halbleiternanostrukturen auf vorstrukturiertem Substrat
… in one-dimensional systems – so called quantum wires – is expected to lead to a greatly enhanced mobility. Furthermore Fermi liquid behavior is predicted to give way to Luttinger liquid behavior due to strong electron correlation while electron-hole interaction should manifest in Fermi …
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Fabrication of nonlithographic semiconductor quantum wire infrared photodetector
The thesis describes novel semiconductor quantum wire infrared photodetectors in the long- and very long-wavelength regions. The infrared photodetectors are based on intersubband transitions in semiconductor quantum wires and have the potential for higher operational temperature, increased …
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Development and Characterization of Intermediate-Band Quantum Wire Solar Cells
<p>The effects of a quantum wire intermediate band, grown by molecular beam epitaxy, on the optical and electrical properties of solar cells are reported. To investigate the behavior of the intermediate band, the quantum wires were remotely doped at three different doping concentrations, the number …
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Experimental Interrogation Of One-Dimensional Excitons In Cadmium Selenide And Cadmium Telluride Quantum Nanostructures
<p>The lengths of one-dimensional quantum wires: QWs) make them excellent candidates for implementation into devices that require charge transport over micrometer-scale distances. Additionally, their tunable band-gap energies, polarized emission, and large absorption cross sections make them quite …
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Rashba-Effekt in niedrigdimensionalen InGaAs/InP Strukturen
… interaction in quasi one-dimensional structures (quantum wires) with typical widths of 150 to 1000 nm. These quantum wires were prepared by metal-organic vapor phase epitaxy and a newly developed selective wet chemical etching process. Magneto-transport measurements have revealed two important …
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