Sökning: "Strongly Correlated Systems"

Visar resultat 16 - 20 av 90 avhandlingar innehållade orden Strongly Correlated Systems.

  1. 16. Fermions in two dimensions and exactly solvable models

    Författare :Jonas de Woul; Edwin Langmann; Fabian Essler; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bosonization; Exactly solvable models; Hubbard model; Mean field theory; Quantum field theory; Strongly correlated systems;

    Sammanfattning : This Ph.D. thesis in mathematical physics concerns systems of interacting fermions with strong correlations. For these systems the physical properties can only be described in terms of the collective behavior of the fermions. LÄS MER

  3. 17. A Matter of Disorder : Monte Carlo Simulations of Phase Transitions in Strongly Disordered Systems

    Författare :Marios Nikolaou; Mats Wallin; Asle Sudbø; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; phase transitions; disorder; Monte Carlo simulations; superconductivity; Statistical physics; Statistisk fysik;

    Sammanfattning : Phase transitions and their critical scaling properties, especially in systems with disorder, are important both for our theoretical understanding of our environment, but also for their practical use in applications and materials in our everyday life. This thesis presents results from finite size scaling analysis of critical phenomena in systems with disorder, using high-precision Monte Carlo simulations and state of the art numerical methods. LÄS MER

  4. 18. Correlated Electronic Structure of Materials : Development and Application of Dynamical Mean Field Theory

    Författare :Patrik Thunström; Olle Eriksson; Alexander Lichtenstein; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; DFT; DMFT; correlation; entanglement; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : This thesis is dedicated to the development, implementation and application of a combination of Density Functional Theory and Dynamical Mean Field Theory. The resulting program is shown through several examples to be a powerful and flexible tool for calculating the electronic structure of strongly correlated materials. LÄS MER

  5. 19. Raman Scattering and Neutron Diffraction Studies of Manganites and Cuprates

    Författare :Joakim Bäckström; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; high-T-c-superconductivity; Reverse Monte Carlo modelling; oxides; strongly correlated systems; manganites; cuprates; neutron diffraction; colossal magnetoresistance; Raman spectroscopy;

    Sammanfattning : This thesis is devoted to experimental studies of two classes of strongly correlated transition metal oxides, namely cuprates and manganite perovskites. Manganites generally display complex phase diagrams, including the so-called colossal magnetoresistance effect. LÄS MER

  7. 20. Multi-species systems in optical lattices : From orbital physics in excited bands to effects of disorder

    Författare :Fernanda Pinheiro; Jonas Larsson; Jani-Petri Martikainen; Ehud Altman; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical Physics; teoretisk fysik;

    Sammanfattning : In this thesis we explore different aspects of the physics of multi-species atomic systems in optical lattices. In the first part we will study cold gases in the first and second excited bands of optical lattices - the p and d bands. LÄS MER