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Showing 1 to 2 of 2 for “"Heisenberg-Modell"”.
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Grundzustandseigenschaften von anisotropen antiferromagnetischen Heisenberg-Ketten mit Spin S = 1
In this thesis ground state properties of S = 1 spin chains with exchange and single-ion anisotropy are analysed. Following earlier publications two cases are mainly considered: A fixed ratio of the two anisotropies as well as a fixed and strong exchange anisotropy. The method primarily employed is …
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Ground States through Variational Optimization using Matrix Product States: a comparison between open and periodic boundary conditions
… Grundzustandsenergien des kritischen Spin-1/2 Heisenberg- und des transversalen Spin-1/2 Ising-Modells in einer Raumdimension. Wir vergleichen offene Randbedingungen (obc) mit periodischen Randbedingungen (pbc). Im Falle von pbc testen wir verschiedene Methoden zur Verbesserung der …