Jung, Peter
(2007).
Transport and Approximate Conservation Laws in Low Dimensional Systems.
PhD thesis, Universität zu Köln.
Abstract
We set up a framework in which controlled lower bounds to conductivities of strongly correlated quantum systems may be calculated perturbatively in situations where the conductivities are infinite in the unperturbed model. This framework is then applied to study the transport properties of almost integrable systems, in general, and heat and spin conductivities in the integrable XXZ Heisenberg spin chain perturbed by various integrability breaking couplings, in particular. Furthermore, we systematically develop a microscopic description of the contribution of spin chains to experimentally measured heat conductivity in spin chain compounds, with an emphasis on the effect of weak disorder.
Item Type: |
Thesis
(PhD thesis)
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Translated title: |
Title | Language |
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Transport und Fast-Erhaltungssätze in Niedrig-Dimensionalen Systemen | German |
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Translated abstract: |
Abstract | Language |
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Wir formulieren eine Störungstheorie mit deren Hilfe Leitfähigkeiten stark korrelierter Quantensysteme, die im ungestörten Fall unendlich sind, berechnet werden können. Wir wenden diese Theorie dann um, allgemein, Transporteigenschaften fast-integrabler Systeme, und speziell, die Wärme- und Spin-Leitfähigkeit in der integrablen XXZ Heisenberg Spinkette mit verschiedenen Störungen, die die Integrabilität brechen, zu studieren an. Zusätzlich entwickeln wir systematisch eine mikroskopische Beschreibung des Spinketten-Beitrags zu in Spinketten-Verbundstoffen experimentell gemessenen Wärmeleitfähigkeit, unter Betonung des Einflusses schwacher Unordnung. | German |
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Creators: |
Creators | Email | ORCID | ORCID Put Code |
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Jung, Peter | pj@thp.uni-koeln.de | UNSPECIFIED | UNSPECIFIED |
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URN: |
urn:nbn:de:hbz:38-22083 |
Date: |
2007 |
Language: |
English |
Faculty: |
Faculty of Mathematics and Natural Sciences |
Divisions: |
Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics |
Subjects: |
Physics |
Uncontrolled Keywords: |
Keywords | Language |
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Transport , Spinketten , Erhaltungssätze , Störungstheorie , Hydrodynamik | German | Transport , Spinchains , Conservation Laws , Perturbation Theory , Hydrodynamics | English |
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Date of oral exam: |
23 November 2006 |
Referee: |
Name | Academic Title |
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Rosch, Achim | Prof. Dr. |
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Refereed: |
Yes |
URI: |
http://kups.ub.uni-koeln.de/id/eprint/2208 |
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