Search for dissertations about: "optical potentials"

Showing result 1 - 5 of 42 swedish dissertations containing the words optical potentials.

2. 1. Ultracold atoms in optical potentials : from noise-induced transport to superfluidity

   Author : Martin Zelan; Claude Dion; Sile Nic Chormaic; Umeå universitet; []
   Keywords : Brownian motors; noise-induced transport; superfluidity; ultracold atoms; optical potentials; optical lattices; laser coooling; fysik; Physics;

   Abstract : In this thesis, both experimental studies and numerical simulations of ultracold atoms in optical potentials are presented in a collection of nine scientific papers. In particular, noise-induced transport in dissipative optical lattices and superfluid properties of Bose-Einstein condensates have been studied. READ MORE

4. 2. Ultracold rubidium atoms in periodic potentials

   Author : Robert Saers; Anders Kastberg; Svante Jonsell; Jan W. Thomsen; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bose-Einstein condensation; optical lattice; quantum phase transition; experiment; theory; Condensed matter physics; Kondenserade materiens fysik;

   Abstract : This thesis includes both experimental and theoretical investigations, presented in a series of eight papers. The experimental part ranges from the construction procedures of an apparatus for Bose-Einstein condensates, to full scale experiments using three different set-ups for ultracold atoms in optical lattices. READ MORE

5. 3. Optical spectroscopy of InGaAs quantum dots

   Author : Arvid Larsson; Per Olof Holtz; Artur Zrenner; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; quantum dot; semiconductor; optical properties; spin; transport; wetting layer; polarization; kvantprick; halvledare; optiska egenskaper; spin; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik; Materials science; Teknisk materialvetenskap; Condensed matter physics; Kondenserade materiens fysik; Semiconductor physics; Halvledarfysik;

   Abstract : The work presented in this thesis deals with optical studies of semiconductor quantum dots (QDs) in the InGaAs material system. It is shown that for self-assembled InAs QDs, the interaction with the surrounding GaAs barrier and the InAs wetting layer (WL) in particular, has a very large impact on their optical properties. READ MORE

6. 4. Cold atoms in a variety of optical lattice potentials

   Author : Robert Saers; Umeå universitet; []
   Keywords : ;

   Abstract : In this thesis, both experimental achievements and theoretical preparatory investigationsfor future experiments are introduced. The experiments presentedare performed with the set-up used for laser cooling and trapping of rubidiumatoms, and the theoretical examinations are adopted for intended experimentson Bose-Einstein Condensates. READ MORE

7. 5. Dynamic and quasi-stationary electrochromic response of amorphous tungsten oxide thin films : In situ combined electrochemical and optical measurements during lithium intercalation

   Author : Edgar Alonso Rojas González; Gunnar Niklasson; Aline Rougier; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Electrochromism; Optical absorption; Amorphous materials; Tungsten oxide; Electrochemical impedance spectroscopy; Color impedance spectroscopy; Intercalation; Engineering Science with specialization in Solid State Physics; Teknisk fysik med inriktning mot fasta tillståndets fysik;

   Abstract : Electrochromic (EC) materials can adjust their optical properties, reversibly, by means of an external electrical stimulus. They have relevant technological applications; for example, energy-efficient smart windows, which can adapt dynamically—according to the given environmental conditions—to control the heat and visible light fluxes between the interior and exterior of a building. READ MORE