Sökning: "Cold atoms"

Visar resultat 1 - 5 av 17 avhandlingar innehållade orden Cold atoms.

  1. 1. Experimental and Numerical Investigations of Ultra-Cold Atoms

    Detta är en avhandling från Umeå : Fysik

    Författare :Magnus Rehn; Anders Kastberg; Claude Dion; Matti Kaivola; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ultracold atoms; optical lattices; Bose-Einstein condensation; quantum phase transitions; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Sammanfattning : I have been one of the main responsible for building a new laboratory for Bose-Einstein condensation with 87Rb. In particular, the experimental setup has been designed for performing experiments with Bose-Einstein condensates load into optical lattices of variable geometries.All parts essential for Bose-Einstein condensation are in place. LÄS MER

  2. 2. Cold atoms in a variety of optical lattice potentials

    Detta är en avhandling från Umeå : Fysik

    Författare :Robert Saers; [2006]
    Nyckelord :;

    Sammanfattning : 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. LÄS MER

  3. 3. Gaps, Traps and Lattices - Correlations in Small Quantum Systems

    Detta är en avhandling från Division of Mathematical Physics, Department of Physics, Faculty of Engineering, Lund University

    Författare :Magnus Borgh; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetiska och optiska ; egenskaper elektriska; Cold atoms; Quantum dots; Optical lattices; classical mechanics; Mathematical and general theoretical physics; Exact diagonalization; Density Functional Theory; Vortices; relativity; quantum mechanics; termodynamik; statistisk fysik; relativitet; kvantmekanik; klassisk mekanik; Matematisk och allmän teoretisk fysik; thermodynamics; statistical physics; Condensed matter:electronic structure; gravitation; supraledare; magnetisk resonans; electrical; magnetic and optical properties; supraconductors; magnetic resonance; relaxation; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; spektroskopi; Fysicumarkivet A:2007:Borgh;

    Sammanfattning : This dissertation investigates properties of two-dimensional many-body systems. Studies are performed using the Spin-Density Functional Theory with the Local Spin-Density Approximation, and numerical exact diagonalization. LÄS MER

  4. 4. Numerical studies of spin chains and cold atoms in optical lattices

    Detta är en avhandling från Stockholm : KTH

    Författare :Sara Bergkvist Sylvan; Anders Rosengren; Richard Scalettar; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Teoretisk Fysik; Kondenserade materiens teori; NATURAL SCIENCES Physics Condensed matter physics; NATURVETENSKAP Fysik Kondenserade materiens fysik;

    Sammanfattning : An important, but also difficult, research field in condensed matter physics is that of strongly correlated systems. This thesis considers two topics in this field.The first topic is disorder and frustration in spin models. The introduction of disorder into quantum spin chains creates a complex problem. LÄS MER

  5. 5. Atomic transport in optical lattices

    Detta är en avhandling från Umeå : Umeå universitet, Institutionen för fysik

    Författare :Henning Hagman; Claude Dion; Daniel Comparat; [2010]
    Nyckelord :Ultra-cold atoms; optical lattice; laser cooling; directed transport; Brownian motor; Brownian motion;

    Sammanfattning : This thesis includes both experimental and theoretical investigations of fluctuation-induced transport phenomena, presented in a series of nine papers, by studies of the dynamics of cold atoms in dissipative optical lattices.With standard laser cooling techniques about 108 cesium atoms are accumulated, cooled to a few μK, and transferred into a dissipative optical lattice. LÄS MER