Density Matrix Approach to Local Hilbert Space Reduction

Details Density Matrix Approach to Local Hilbert Space Reduction Density Matrix Approach to Local Hilbert Space Reduction

1997-09-16

arxiv.org/abs/cond-mat/9709187v1

Physical Review Letters 80, 2661 (1998)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.80.2661

We present a density matrix approach for treating systems with a large or infinite number of degrees of freedom per site with exact diagonalization or the density matrix renormalization group. The method is demonstrated on the 1D Holstein model of electrons coupled to Einstein phonons. In this system, two or three optimized phonon modes per site give results as accurate as with 10-100 bare phonon levels per site.

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