A concise approach for one-dimensional Holstein model

作者:Ren Qing Bao*; Chen Qing Hu
来源:International Journal of Modern Physics B, 2007, 21(23-24): 4230-4233.
DOI:10.1142/S0217979207045451

摘要

A concise variational approach is to propose to calculate the ground-state properties of none-dimensional Holstein model. The results in the weak and strong coupling limit can be easily recovered analytically. It is shown that, in the nontrivial intermediate electron-phonon coupling regime, the present results are in good agreement with those by density-matrix renormalization group and numerical exact diagonalizations. The present approach is more concise than any other analytical ones in this field, and can be easily generalized to Holstein models in higher dimensions and with more electrons.