Sökning: "single crystal"

Visar resultat 16 - 20 av 461 avhandlingar innehållade orden single crystal.

1. 16. Optical studies of crystal phase heterostructures

   Författare :Irene Geijselaers; NanoLund: Centre for Nanoscience; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; III-V semiconductor nanowires; photoluminescence; photoluminescence excitation; polytype; crystal phase heterostructure; InP; GaAs; wurtzite; Fysicumarkivet A:2021:Geijselaers;

   Sammanfattning : III-V semiconductors are commonly used for a variety of optical applications, such as LED based lights and solar sells. Most III-V semiconductors, such as GaAs and InP, exhibit the zinc-blende (zb) crystal structure, but in the form of nanowires it is also possible to create them in the wurtzite (wz) crystal structure. LÄS MER

3. 17. Towards single Ce ion detection in a bulk crystal for the development of a single-ion qubit readout scheme

   Författare :Ying Yan; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysicumarkivet A:2013:Yan; Ultra-violet laser spectroscopy; Single ion detection; Rare-earth-ion-doped crystals; Quantum computing; Laser stabilisation;

   Sammanfattning : The work presented in this thesis was concerned with investigating the relevant spectroscopic properties of Ce ions randomly doped in an Y2SiO5 crystal at low temperatures (around 4 K), in order to develop a technique and an experimental set-up to detect the fluorescence photons emitted by a single Ce ion. The aim of the work was to determine whether a single Ce ion (referred to as the readout ion) can be used as a local probe to sense the quantum state of a neighbouring single-ion qubit via a state-selective interaction between the readout and qubit ion. LÄS MER

4. 18. Single crystal sapphire dental implants : experimental and clinical studies

   Författare :Bahman Fartash; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :edentulous mandible; implantology; sapphire dental implants; overdenture; long-term follow-up; radiography; osseointegration; peri-implant mucosa; corrosion; cell culture; animal experiments; light microscopy; scanning electron microscopy; histometri;

   Sammanfattning : The aim of this project was to evaluate single synthetic sapphire crystals as dental implants, with special reference to correlation of clinical and in vitro/in vivo methods of research. The laboratory studies confirmed chemical stability. LÄS MER

5. 19. Toughness Enhancement in Hard Single-Crystal Transition-Metal Nitrides : V-Mo-N and V-W-N Alloys

   Författare :Hanna Kindlund; Lars Hultman; Jens Birch; Daniel Gall; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : Transition-metal nitrides are known for their high hardness, good wear resistance, high-temperature stability, and chemical inertness. Because of these properties, they are extensively used in many industrial applications, notably as protective wear, erosion, and scratch resistant coatings, which are often subjected to high thermo-mechanical stresses. LÄS MER

7. 20. Molecular Alligator Clips: A Study of Metal-Molecule Contacts for Molecular Electronics

   Författare :Anton Grigoriev; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nonequilibrium Green s functions; single crystal surfaces; nanostructures; chemisorption; selenium; low index single crystal surface; density functional calculations; organic molecules; sulphur; nonequilibrium electron transport; gold;

   Sammanfattning : In this thesis we present a computational study of the elementary building blocks for molecular electronics, interconnected electronic devices with critical dimensions below 5 nm. Building electronic circuits on that scale requires stable connection between the various parts of the device and to the macroscopic metal electrodes, needed for power supply, support and integration with conventional electronics. LÄS MER