Search for dissertations about: "nanosystem"

Showing result 6 - 10 of 10 swedish dissertations containing the word nanosystem.

2. 6. Analytical and Numerical Developments in Strongly Correlated Systems: Perspectives from TDDFT and Green's Functions

   Author : Daniel Karlsson; Matematisk fysik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Many-Body Perturbation Theory; Hubbard model; TDDFT; Green s function; DFT; Quantum Transport; Disorder; Fysicumarkivet A:2014:Karlsson;

   Abstract : This thesis investigates different methods for treating strongly correlated systems, and discusses their respective strengths and weaknesses. Many of the results presented in this thesis come from comparing the different methods and approximations to exact results. READ MORE

4. 7. Dynamics and Fluctuations in Single-Electron Tunneling Devices

   Author : Niklas Dittmann; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; quantum dot; time-dependent density-functional theory; perturbation theory; single-electron source;

   Abstract : In recent years, it has been routinely achieved to build nanoscale electronic devices, which generate current pulses carrying only a single elementary charge. Realizations of these single-electron emitters are based on time-dependently driven quantum dots, on single-electron turnstiles built from superconductor/normal-metal hybrid structures, and also on nanosystems employing Lorentzian voltage pulses or surface acoustic waves. READ MORE

5. 8. Synthesis, Characterization and Applications of Metal Oxide Nanostructures

   Author : Mushtaque Hussain; Magnus Willander; Omer Nour; Vladimir V. Mitin; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aqueous chemical growth method; ZnO nanorods; Oxygen plasma treatment; Piezoelectric and mechanical properties; Atomic force microscope; Nanoindentation; Co3O4 nanostructures; Anions effect; pH sensor; NiCo2O4 nanostructures; Glucose sensor;

   Abstract : The main objective of nanotechnology is to build self-powered nanosystems that are ultrasmall in size, exhibit super sensitivity, extraordinary multi functionality, and extremely low power consumption. As we all know that 21st century has brought two most important challenges for us. One is energy shortage and the other is global warming. READ MORE

6. 9. Elastic Properties of Nanowires - an Atomistic Evaluation

   Author : Pär Olsson; Mekanik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : Nanowires constitute one of the fundamental building blocks in assembled nanodevices. Due to the high surface to volume ratio, the fraction of surface atoms is not negligible for nanosized elements. READ MORE

7. 10. Theoretical perspectives on ultrafast and non-linear spectroscopy

   Author : Emil Vinas Boström; Matematisk fysik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Non-linear optics; Ultrafast dynamics; Non-equilibrium Green s functions; Density functional theory; Multi-photon absorption; Second harmonic generation; Desorption dynamics; Auger decay; Charge-separation dynamics; Quantum Zeno effect; Fysicumarkivet A:2018:Vinas Boström;

   Abstract : In this thesis we discuss a theoretical description of ultrafast and non-linear spectroscopy. Due to the high intensities and ultrashort pulse durations involved in such experiments, it is necessary to use an explicitly time-dependent formalism. READ MORE