Sökning: "Brownian motor"

Hittade 5 avhandlingar innehållade orden Brownian motor.

  1. 1. 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

  2. 2. Laser cooling mechanisms and Brownian motors in optical lattices

    Detta är en avhandling från Umeå : Fysik

    Författare :Peder Sjölund; Anders Kastberg; Svante Jonsell; Chris Westbrook; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TECHNOLOGY Engineering physics Optical physics; TEKNIKVETENSKAP Teknisk fysik Optisk fysik;

    Sammanfattning : Denna avhandling innefattar såväl experimentella som numeriska studier av laserkylda atomer i optiska kristallgitter. Bland annat har laserkylningsprocesser studerats, där atomers rörelser i optiska kristallgitter har uppvisat andra typer av bakomliggande mekanismer än de som tidigare förutsågs genom “Sisyfoskylningsmodellen”. LÄS MER

  3. 3. Ultracold atoms in optical potentials from noise-induced transport to superfluidity

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

    Författare :Martin Zelan; Claude Dion; Sile Nic Chormaic; [2011]
    Nyckelord :Brownian motors; noise-induced transport; superfluidity; ultracold atoms; optical potentials; optical lattices; laser coooling; fysik; Physics;

    Sammanfattning : 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. LÄS MER

  4. 4. Optical manipulation and heating of gold nanoparticles near interfaces

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

    Författare :Daniel Andrén; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LSPR spectroscopy; particle-surface separation distance; thermal reshaping; TIRM; nanomotor; plasmonics; photothermal effects; Brownian dynamics; gold nanorod; optical tweezers;

    Sammanfattning : By focusing laser light to small volumes, its momentum can be used to trap and manipulate objects in the size range from cells down to single atoms. Devices using this effect are called optical tweezers, and have found use in measuring and applying minuscule forces and torques, contributed to deepening our knowledge of molecular motors, unraveling the mechanics of cells and DNA, and better understand statistical mechanics and hydrodynamic interactions at the nanoscale. LÄS MER

  5. 5. Feedback in Small Systems -A Stochastic Thermodynamic Perspective

    Detta är en avhandling från Department of Physics, Lund University

    Författare :Regina Schmitt; [2018]

    Sammanfattning : Recent advances in nanotechnology and the accompanying development oftechniques that operate and manipulate systems on the micro- and nanometer scale have driven the development of stochastic thermodynamics. This isa theory that can describe small systems far from equilibrium, where the fluctuations are of the same order of magnitude as the mean values. LÄS MER