We propose a new optimized phonon approach for the numerical diagonalization of interacting electron-phonon systems combining density-matrix and Lanczos algorithms. We demonstrate the reliablity of this approach by calculating the phase diagram for bi-polaron formation in the one-dimensional Holstein-Hubbard model, and the Luttinger parameters for the metallic phase of the half-filled one-dimensional Holstein model of spinless fermions.
@article{arxiv.cond-mat/0003125,
title = {Optimized phonon approach for the diagonalization of electron-phonon problems},
author = {A. Weisse and H. Fehske and G. Wellein and A. R. Bishop},
journal= {arXiv preprint arXiv:cond-mat/0003125},
year = {2007}
}
Comments
4 pages, 4 figures included, submitted to Phys. Rev. B