Density Matrix Renormalization Group and Reaction-Diffusion Processes

Details Density Matrix Renormalization Group and Reaction-Diffusion Processes Density Matrix Renormalization Group and Reaction-Diffusion Processes

1999-02-03

arxiv.org/abs/cond-mat/9902041v1

Eur.Phys.J.B12:99,1999

Physics

Condensed Matter

Statistical Mechanics

16 pages, latex, 5 PostScript figures included

Scientific paper

10.1007/s100510050983

The density matrix renormalization group (DMRG) is applied to some one-dimensional reaction-diffusion models in the vicinity of and at their critical point. The stochastic time evolution for these models is given in terms of a non-symmetric ``quantum Hamiltonian'', which is diagonalized using the DMRG method for open chains of moderate lengths (up to about 60 sites). The numerical diagonalization methods for non-symmetric matrices are reviewed. Different choices for an appropriate density matrix in the non-symmetric DMRG are discussed. Accurate estimates of the steady-state critical points and exponents can then be found from finite-size scaling through standard finite-lattice extrapolation methods. This is exemplified by studying the leading relaxation time and the density profiles of diffusion-annihilation and of a branching-fusing model in the directed percolation universality class.

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