Sökning: "antiferromagnets"
Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet antiferromagnets.
1. Atomistic Spin Dynamics, Theory and Applications
Sammanfattning : The topic of this Thesis is magnetization dynamics on atomic length scales. A computational scheme, Atomistic Spin Dynamics, based on density functional theory, the adiabatic approximation and the atomic moment approximation is presented. LÄS MER
2. Anyons and antiferromagnets : two two-dimensional topics
Sammanfattning : .... LÄS MER
3. Antiferromagnets and Luttinger Liquids: Two Strongly Correlated Systems
Sammanfattning : Strongly correlated systems show a variety of intriguing properties and have been extensively studied over the years. In this thesis two strongly correlated systems are discussed: the two-dimensional antiferromagnet and the Luttinger liquid. The Luttinger liquid has attracted much interest as a paradigm of non-Fermi liquid behavior. LÄS MER
4. Numerical Renormalization, Doped Antiferromagnets, and Statistics - Topics in Low Dimensional Physics
Sammanfattning : The first part of the thesis deals with so called numerical renormalization group methods, and in particular the density-matrix renormalization group (DMRG). This method performs extremely well for large one-dimensional quantum systems like spin-chains and Hubbard models. LÄS MER
5. Criticality and Frustration: Classical and Quantum Spin Models in Two Dimensions
Sammanfattning : We investigate two-dimensional spin models and begin with an introduction to critical phenomena with emphasis on classical systems with boundaries and conformal invariance. Then we introduce the antiferromagnetic quantum Heisenberg model with frustrating interactions. LÄS MER