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We report a way of wave function estimation for the density matrixrenormalization group (DMRG) method applied to quantum systems, which has2-site modulation, when the system size extension is necessary in both thefinite and the infinite algorithms. The estimation is performed byrenormalization group (RG) transformation applied to the ground state wavefunction, which is represented as the matrix product. This RG scheme is knownas the product wave function renormalization group (PWFRG) method. In order totreat the 2-site modulation, the operation of the RG transformation is shiftedby amount of 2 lattice sites. It turns out that this 2-site shift algorithmprovides better wave function estimation in the thermodynamic limit, comparedwith the previously known PWFRG algorithm.

Two-Site shift Product Wave Function Renormalization Group Method Applied to Quantum Systems