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We study the interface tension of the 4-state Potts model in three dimensionsusing the Wang- Landau algorithm. The interface tension is given by the ratioof the partition function with a twisted boundary condition in one directionand periodic boundary conditions in all other directions over the partitionfunction with periodic boundary conditions in all directions. With theWang-Landau algorithm we can explicitly calculate both partition functions andobtain the result for all temperatures. We find solid numerical evidence forperfect wetting. Our algorithm is tested by calculating thermodynamicquantities at the phase transition point.

Interface tension of the 3d 4-state Potts model using the Wang-Landau algorithm