Thermodynamic limit of the density matrix renormalization for the spin-1 Heisenberg chain

Details Thermodynamic limit of the density matrix renormalization for the spin-1 Heisenberg chain Thermodynamic limit of the density matrix renormalization for the spin-1 Heisenberg chain

1995-03-17

arxiv.org/abs/cond-mat/9503107v1

Phys.Rev.Lett.75:3537-3540,1995

Physics

Condensed Matter

13 pages uuencoded compressed postscript including figures

Scientific paper

10.1103/PhysRevLett.75.3537

The density matrix renormalization group (``DMRG'') discovered by White has shown to be a powerful method to understand the properties of many one dimensional quantum systems. In the case where renormalization eventually converges to a fixed point we show that quantum states in the thermodynamic limit with periodic boundary conditions can be simply represented by a special type of product ground state with a natural description of Bloch states of elementary excitations that are spin-1 solitons. We then observe that these states can be rederived through a simple variational ansatz making no reference to a renormalization construction. The method is tested on the spin-1 Heisenberg model.

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