Sökning: "Hubbard Model"

Visar resultat 16 - 20 av 36 avhandlingar innehållade orden Hubbard Model.

  1. 16. Spin splitting in open quantum dots and related systems

    Författare :Martin Evaldsson; Igor Zozoulenko; Igor Abrikosov; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mesoscopic systems; 2DEG; ballistic transport; quantum dots; spin-polarised transport in quantum dots; spontanueous spin-splitting; Mesoscopic physics; Mesoskopisk fysik;

    Sammanfattning : This thesis addresses electron spin phenomena in semi-conductor quantum dots/anti-dots from a computational perspective. In the first paper (paper I) we have studied spin-dependent transport through open quantum dots, i.e., dots strongly coupled to their leads, within the Hubbard model. LÄS MER

  3. 17. Study of the phase diagram of Zn symmetric chains

    Författare :Iman Mahyaeh; Eddy Ardonne; Supriya Krishnamurthy; Joost Slingerland; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; teoretisk fysik; Theoretical Physics;

    Sammanfattning : In this thesis we study the phase diagrams of Zn symmetric chains. We start with investigating the topological phases of the Kitaev chain, a Z2 symmetric model, with long range couplings and a phase gradient. LÄS MER

  4. 18. Finite Energy Electronic Correlationsin Low-Dimensional Systems

    Författare :Daniel Bozi; Portugal Universidade do Minho; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis report deals with the 1D Hubbard model and the quantum objects that diagonalize the normal ordered Hubbard hamiltonian, among those the so called PseudoFermions (PFs). These PFs have no residual energy interactions, are eta-spin and spin zero objects, and are the scatterers and the scattering centers of the theory. LÄS MER

  5. 19. Nonlinear Dynamics and Condensed States with Broken Symmetries

    Författare :Anders B. Eriksson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis concerns two topics where symmetry and strong correlations in time and space are important. The first topic is the theory of dynamical systems, and this theory deals with generic phenomena which are often convenient to study in very simple models. LÄS MER

  7. 20. Non-equilibrium fermions within lattice density functional theory: quantum transport and ultracold-atom phenomena

    Författare :Alexey Kartsev; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysicumarkivet A:2013:Kartsev;

    Sammanfattning : Cutting-edge technology needs small, ultrafast devices, operational in a wide range of regimes. This calls for solids with novel, unconventional and tailorable properties. Great progress is expected from materials in which electron-electron and electron-phonon correlations strongly affect the dynamics ( i.e. LÄS MER