Thermalization in one-dimensional quantum-many-body systems

von Fabian Ralf Anton Biebl
Dissertation
Datum der mündl. Prüfung:2016-12-14
Erschienen:2017-01-16
Betreuer:Prof. Dr. Stefan Kehrein
Gutachter:Prof. Dr. Stefan Kehrein
Gutachter:Prof. Dr. Peter E. Blöchl
Gutachter:Prof. Dr. Reiner Kree
Gutachter:PD Dr. Salvatore R. Manmana
Gutachter:Prof. Dr. Stefan Mathias
Gutachter:Prof. Dr. Cynthia A. Volkert
Zum Verlinken/Zitieren: http://dx.doi.org/10.53846/goediss-6079

 

 

Dateien

Name:Dissertation_FabianBiebl_weboptimiert.pdf
Size:11.7Mb
Format:PDF
Description:Dissertation von Fabian R. A. Biebl

Lizenzbestimmungen:

Zusammenfassung

Englisch

We consider the thermalization of the momentum distribution in two one-dimensional models. The first one is the integrable Hubbard model with an additional integrability breaking term in the Hamiltonian, which is a next-to-nearest-neighbor hopping term. This has been previously investigated by Fürst et al. (PRE 86:031122, 2012; PRE 88:012108, 2013). They considered several initial quasiparticle momentum distributions and their relaxation times for different strengths of the next-to-nearest-neighbor hopping amplitude. We find the dependence of the thermalization rates on the model parameters, on the filling and on temperature for any initial quasiparticle momentum distribution in the regime of small integrability breaking using a Boltzmann equation. The second model is an effective model describing a chain of manganite octahedra. There, we investigate a the temperature dependence of the relaxation rates for reasonable choices of the model parameters and the filling.
Keywords: thermalization; Boltzmann equation; Hubbard model; non-equilibrium; condensed matter; electrons; manganites
 
Statistik