TWO-DIMENSIONAL WANG–LANDAU SAMPLING OF AN ASYMMETRIC ISING MODEL

Shan-Ho Tsai (), Fugao Wang and D. P. Landau ()
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Shan-Ho Tsai: Enterprise Information Technology Services, University of Georgia, Athens, GA 30602, USA;
Fugao Wang: Center for Simulational Physics, University of Georgia, Athens, GA 30602, USA
D. P. Landau: Center for Simulational Physics, University of Georgia, Athens, GA 30602, USA

International Journal of Modern Physics C (IJMPC), 2009, vol. 20, issue 09, 1357-1366

Abstract: We study the critical endpoint behavior of an asymmetric Ising model with two- and three-body interactions on a triangular lattice, in the presence of an external field. We use a two-dimensional Wang–Landau sampling method to determine the density of states for this model. An accurate density of states allowed us to map out the phase diagram accurately and observe a clear divergence of the curvature of the spectator phase boundary and of the derivative of the magnetization coexistence diameter near the critical endpoint, in agreement with previous theoretical predictions.

Keywords: Critical endpoint; Wang–Landau sampling; Ising model; triangular lattice; three-body interaction; 05.50.+q; 64.60.Cn (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0129183109014424

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