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DY: Dynamik und Statistische Physik
DY 10: Critical Phenomena
DY 10.2: Talk
Monday, March 8, 2004, 10:00–10:15, H2
Phase Diagram of the Generalized Complex |ψ|4 Model — •E. Bittner und W. Janke — Institut für Theoretische Physik, Universität Leipzig, Augustusplatz 10/11, 04109 Leipzig, Germany
Using Monte Carlo simulations, we analyze the critical behaviour of the complex |ψ|4 theory in the presence of an additional fugacity term. With this modification we can show that the complex |ψ|4 theory can be tuned to undergo a first-order transition by varying the strength of the new term in the generalized Hamiltonian. From a finite-size scaling analysis we determine the critical endpoint of the line of first-order phase transitions for several values of the strength of the new term in the generalized Hamiltonian. Based on these results we sketch the phase diagram of the generalized complex |ψ|4 model.