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Analytische Verfahren zur Untersuchung von Quantenspinsystemen : rotationsinvariante Greenfunktionsmethode und lineare Spinwellentheorie

Autor :Dirk P. Schmalfuß
Herkunft :OvGU Magdeburg, Fakultät für Naturwissenschaften
Datum :08.02.2005
 
Dokumente :
Dataobject from HALCoRe_document_00004806
 
Typ :Dissertation
Format :Text
Kurzfassung :The ground state of a spin-half Heisenberg antiferromagnet on the stacked kagome lattice by using a spin-rotation-invariant Green's function method is studied. Since the pure two-dimensional kagome antiferromagnet is most likely a magnetically disordered quantum spin liquid, the question whether the coupling of kagome layers in a stacked three-dimensional system may lead to a magnetically ordered ground state is investigated. Spin-spin correlation functions and correlation lengths are presented. For comparison linear spin wave theory is also applied. The results provide strong evidence that the system remains short-range ordered independent of the sign and the strength of the interlayer coupling.
Schlagwörter :Heisenberg model, quantum spin, kagome lattice, green's function method, spin wave theory
Rechte :Dieser Text ist urheberrechtlich geschützt.
Größe :134 S.
 
Erstellt am :01.10.2008 - 07:33:43
Letzte Änderung :22.04.2010 - 08:39:16
MyCoRe ID :HALCoRe_document_00004806
Statische URL :http://edoc.bibliothek.uni-halle.de/servlets/DocumentServlet?id=4806