Frankfurt 2006 – scientific programme
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Q: Quantenoptik und Photonik
Q 8: Quantengase II
Q 8.6: Talk
Monday, March 13, 2006, 15:15–15:30, HVI
Critical Temperatures of F=1 Spinor Condensate — •Parvis Soltan-Panahi1, Axel Pelster2, and Hagen Kleinert1 — 1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Fachbereich Physik, Universität Duisburg-Essen, Universitätsstraße 5, 45117 Essen, Germany
Applying the functional integral approach of many-body theory, we investigate the thermodynamical properties of a spinor condensate with spin F=1. At first, we neglect any two-particle interaction and compute the temperature dependence of the specific heat and the magnetic susceptibility. Furthermore, we determine how the critical temperatures for the occurrence of the ferromagnetic and the antiferromagnetic phase change with the magnetization of the system. Finally, we elaborate how these critical temperatures are affected by additional short-range two-particle interactions within a mean-field approximation.