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The classical two-dimensional anisotropic triangular nearest-neighbor Ising(ATNNI) model is studied by the density matrix renormalization group (DMRG)technique when periodic boundary conditions are imposed. Applying thefinite-size scaling to the DMRG results a commensurate-disordered (C-D) phasetransition line as well as temperature and magnetic critical exponents arecalculated. We conclude that the (C-D) phase transition in the ATNNI modelbelongs to the same universality class as the ordered-disordered phasetransition of the Ising model.Comment: 6 pages, 4 figure

The commensurate-disordered phase transition in the 2D classical ATNNI model studied by DMRG