Sökning: "quantum wire"
Visar resultat 11 - 15 av 23 avhandlingar innehållade orden quantum wire.
11. Spectroscopic studies of InGaAs/GaAs/A1GaAs quantum dots and wires
Sammanfattning : It is demonstrated that the photoluminescence (PL) spectra of single selfassembled lnAs/GaAs quantum dots (QDs) are very sensitive to excitation energy and crystal temperature, which is explained in terms of modulation of the effective diffusivity of the photogenerated carriers affecting the capture probability into theQD. This effect results in a population of the QD with excess electrons, and can be used as a simple tool to create and study charged exciton complexes. LÄS MER
12. Electronic structure and optical properties of InGaAs and InAsP semiconductor quantum wires
Sammanfattning : In recent years intensive studies of semiconductor nanostructures or so-called semiconductor quantum structures have been performed in many research groups around the world. The research interest in quantum structures arises both from their potential to expose new physical phenomena in condensed matter physics, allied with fundamental quantum mechanical effects, and from their potential application in electronic and optoelectronic devices. LÄS MER
13. Electronic Structure and Transport in Nanofabricated Low-Dimensional Semiconductor Systems : A theoretical study
Sammanfattning : Systematic studies of the transport properties in one type of low-dimensional semiconductor nanostructures, in which the motion of carriers is governed by quantum mechanics, are presented in this thesis. In addition, the electronic states in lowdimensional systems fabricated from GaAs / Al?Ga1-?As heterostructures have been investigated by using both transport methods and the static calculations. LÄS MER
14. Effects of Coherence and Correlations on Transport through Nanostructures
Sammanfattning : This dissertation deals with the effects of coherence and correlations on transport through nanostructures. Simulations are mainly performed using the second order von Neumann approach, a method capable of dealing with these effects in the presence of higher order tunneling. LÄS MER
15. Image Processing in High Resolution Transmission Electron Microscopy of Inorganic Materials
Sammanfattning : High resolution transmission electron microscopy and digital image processing has been used to investigate the structure and properties of inorganic materials. The image processing was performed with the programming language Semper. All routines are listed in the appendix. LÄS MER
