Acoustic charge manipulation in semiconductor nanostructures for optical applications [Elektronische Ressource] / Stefan Völk

Acoustic charge manipulation insemiconductor nanostructures foroptical applicationsStefan VölkDissertation zur Erlangung des Doktorgradesder mathematisch-naturwissenschaftlichen Fakultätder Universität AugsburgJuni 2010Erstgutachter: Prof. Dr. Achim WixforthZweitgutachter: Priv-Doz. Dr. Sigmund KohlerTag der mündlichen Prüfung: 30. Juli 2010AbstractWithin this thesis, the influence of a surface acoustic wave (SAW) on the lumi-nescence of semiconductor nanostructures is investigated. The main intentionof this thesis is to use SAWs, in order to acoustically trigger the luminescenceof a single quantum dot (QD) structure.Beginning with the physics of low-dimensional semiconductor structures, thequantum mechanical and optical properties of QD systems are discussed. Inparticular,intrinsicparametersofQDssuchasmorphology, composition, strainand occupation with carriers are taken into account. Subsequently, the influ-ence of an applied electric field and externally induced strain are introduced.From this general approach, the discussion is focused to quantum posts (QPs)which are columnar shaped semiconductor nanostructures. In contrast to con-ventional self-assembled QDs, the height of the QPs can be controlled by theepitaxial growth process. Due to the adjustable height, electronic states andtherefore the exciton transition energies can be tailored.