The Monte Carlo Computer Experiment to Study the Order and Phase Transitions in the Mixed Phase Region Based on the Example of the 3D Ashkin-Teller Model

• Autorzy: Wojtkowiak Z. , Musiał G.

Identyfikatory

DOI

10.12921/cmst.2021.0000019

• Języki publikacji: EN

Abstrakty

EN

In this paper, we demonstrate a new way of performing Monte Carlo (MC) simulations in a mixed phase region that is difficult to study, where with certain probabilities there are different ordering ways. That results in a large oscillation of the values of the computed thermodynamic quantities, which makes their interpretation very problematic. Our results are presented on the example of the 3D Askin-Teller (AT) model, where within a certain range of parameters with equal probabilities there are two different, but equivalent, ways of ordering two of the three order parameters showing independent behavior. The use of our new approach in an MC computer experiment allowed us to use Binder cumulant as well as Challaand the Lee-Kosterlitz-like cumulants. This made it possible to locate phase transitions precisely enough to be able to use the energy distribution histogram method. According to the most effective strategy in the critical region we use our recently proposed cluster MC algorithm and the Metropolis algorithm beyond it, which are suitable for both the first-order and the continuous phase transitions in the 3D AT model. The new approach was demonstrated by determining smooth curves of magnetization and internal energy, and as a consequence by determining the location and character of the phase transition on the line between the mixed phase region and the paramagnetic phase.

Słowa kluczowe

EN

mixed phase region; Monte Carlo computer experiment; phase transitions; lattice spin systems; 3D Ashkin-Teller model

• Wydawca: Institute of Bioorganic Chemistry Scientific Publishers OWN, Polish Academy of Sciences
• Czasopismo: Computational Methods in Science and Technology
• Rocznik: 2021
• Tom: Vol. 27, No. 3
• Strony: 129--136
• Opis fizyczny: Bibliogr. 42 poz., rys.

Twórcy

autor

Wojtkowiak Z.

• Adam Mickiewicz University Faculty of Physics ul. Uniwersytetu Poznańskiego 2 61-614 Poznań, Poland

autor

Musiał G.

• Adam Mickiewicz University Faculty of Physics ul. Uniwersytetu Poznańskiego 2 61-614 Poznań, Poland

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).