Search for dissertations about: "spin-1"

Showing result 1 - 5 of 18 swedish dissertations containing the word spin-1.

  2. 1. Renormalization of perturbations in the spin-1/2 chain

    Author : David Gustafsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; non-abelian bosonization; renormalization group; perturbations; operator product expansion; Spin- 1 2 chain;

    Abstract : .... READ MORE

  4. 2. Strongly Interacting Electrons in One and Two Dimensions

    Author : Fabrizio Anfuso; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : In this thesis I present a theoretical study of three differentstrongly correlated systems: Luttinger liquids, spin-1 chains andthe two-dimensional spin-1/2 Heisenberg model.For every sub-field of our research I summarize the background andprovide further details to the work presented in the appendedpapers. READ MORE

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

    Author : Sara Bergkvist Sylvan; Anders Rosengren; Richard Scalettar; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Teoretisk Fysik; Kondenserade materiens teori; Condensed matter physics; Kondenserade materiens fysik;

    Abstract : 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. READ MORE

  6. 4. Strongly Correlated Models in One Dimension from a Density Matrix Renormalization Group Perspective

    Author : Stefan Rommer; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; matrix product states; impurities; density matrix renormalization group; Heisenberg model; spin chain; DMRG;

    Abstract : The density matrix renormalization group (DMRG) is a numerical method for studying low dimensional strongly correlated models. The study of these models is one of the most active areas of condensed matter physics today and has been spurred not only by the discovery of high temperature superconductivity but also by experiments on new compounds. READ MORE

  7. 5. Modelling of spin and other quantum effects in plasmas

    Author : Jens Zamanian; Mattias Marklund; Gert Brodin; Bengt Eliasson; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The development of quantum mechanics during the 20th century gave rise to a completely new way of describing physics. The interpretation of quantum theory is inherently difficult: for example, many-body systems are described by a so called density matrix which has no straightforward analogue in classical theory. READ MORE