Browsing by Author "Heiss, W. D."
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- ItemOn the thermodynamic limit at a quantum critical point(Academy of Science for South Africa, 2005) Geyer, H. B.; Heiss, W. D.; Scholtz, F. G.Open questions regarding the uniqueness and existence of the thermodynamic limit at a quantum critical point are discussed in the context of the Lipkin model, a popular model in many-body theory. This model illustrates a quantum phase transition, including spontaneous symmetry breaking. The thermodynamic limit seemingly yields different answers depending on the approach used. The discussion is based on recent developments, including a joint publication by the authors.