Search for dissertations about: "Spin- 1 2 chain"
Showing result 1 - 5 of 11 swedish dissertations containing the words Spin- 1 2 chain.
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1. Renormalization of perturbations in the spin-1/2 chain
Abstract : .... READ MORE
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2. Strongly Correlated Models in One Dimension from a Density Matrix Renormalization Group Perspective
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
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3. Role of charge and spin fluctuations and their interplay in solids : A Green’s function approach
Abstract : Due to the large number of electrons, solid state physics boils down to many-body approximations in which only selected types of collective excitations are taken into account, guided by the emergent properties of the material under study. In this thesis, the collective excitations of primary interest are electronic charge and spin fluctuations(plasmons and magnons) and nuclear charge fluctuations (phonons). READ MORE
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4. Strongly Interacting Electrons in One and Two Dimensions
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
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5. Vertical charge transport in conjugated polymers
Abstract : Conjugated polymers are novel organic electronic materials highly important for organic photovoltaic applications. Charge transport is one of the key properties which defines the performance of conjugated polymers in electronic devices. READ MORE