Sökning: "long-range interactions"

Visar resultat 1 - 5 av 81 avhandlingar innehållade orden long-range interactions.

  1. 1. Designing order with long-range interactions in mesoscopic magnetic chains

    Författare :Christina Vantaraki; Vassilios Kapaklis; Björgvin Hjörvarsson; Gabriella Andersson; Tapati Sarkar; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetism; mesospins; mesoscopic magnetic chains; magnetic nanostructures; long-range interactions;

    Sammanfattning : This thesis investigates how the low-energy magnetic configuration of a mesoscopic chain can be tuned by geometrical modifications. The magnetic arrays made by single-domain stadium shaped elements positioned side-by-side were fabricated by patterning into a sputtered ferromagnetic thin film. LÄS MER

  3. 2. First-principles calculations of long-range intermolecular dispersion forces

    Författare :Auayporn Jiemchooroj; Bo E. Sernelius; Irina Yakimenko; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; van der Waals forces; dispersion forces; intermolecular interactions; dispersion coefficients; polarizability; Physics; Fysik;

    Sammanfattning : This work presents first-principles calculations of long-range intermolecular dispersion energies between two atoms or molecules as expressed in terms of the C6 dipole-dipole dispersion coefficients. In a series of publications, it has been shown by us that the complex linear polarization propagator method provides accurate ab initio and first-principles density functional theory values of the C6 dispersion coefficients in comparison with those reported in the literature. LÄS MER

  4. 3. Bound by long-range interactions: Molecular crystals and benzene on Cu(111)

    Författare :Kristian Berland; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; DFT; diffusion barriers; sparse matter; platonic hydrocarbons; molecular crystals; van der Waals density functional vdW-DF ; van der Waals forces; London-dispersion forces; self-assembly; hexamine; molecular overlayers; electronic structure; Friedel oscillations; soft matter; surface-mediated interactions; physiosorption;

    Sammanfattning : This thesis investigates molecular systems bound by long-range interactions. Westudy molecular crystals held together by van der Waals forces and the physisorption of benzene (Bz) on Cu(111). LÄS MER

  5. 4. Spin ice and demagnetising theory

    Författare :Mikael Twengström; Patrik Henelius; Peter Holdsworth; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geometrical frustration; spin ice; Monte Carlo simulations; demagnetising theory; special temperatures; Ewald summation; neutron scattering; structure factors; loop algorithms; parallel tempering; frustrated ferromagnets; equilibration issues; long-range interactions; exchange interactions.; Fysik; Physics;

    Sammanfattning : Frustration, or the inability to simultaneously minimise all local interactions is, a phenomenon occurring in a broad number of physical systems. We will in this thesis focus on a class of frustrated ferromagnetic materials called spin ices and how both numerical and experimental techniques can be used to understand their properties. LÄS MER

  7. 5. Exploring the Interactive Landscape of Lipid Bilayers

    Författare :Christian L. Wennberg; Erik Lindahl; Arnold Maliniak; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molecular Dynamics; lipid bilayer; cholesterol; permeability; long-range interactions; Lennard-Jones; dispersion; particle-mesh Ewald; Biological Physics; Biologisk fysik;

    Sammanfattning : One of the most important aspects for all life on this planet is theact to keep their cellular processes in a state where they do notreach equilibrium. One part in the upholding of this imbalanced stateis the barrier between the cells and their surroundings, created bythe cell membrane. LÄS MER