Polaron features of the one-dimensional Holstein molecular crystal model
V. Cataudella, G. De Filippis, Giuseppe Iadonisi
The polaron features of the one-dimensional Holstein model are investigated by improving a variational method introduced recently and based on a linear superposition of Bloch states that describe large and small polaron wave functions. The mean number of phonons, the polaron kinetic energy, the electron-phonon local correlation function, and the ground-state spectral weight are calculated and discussed. A crossover regime between large and small polarons for any value of the adiabatic parameter ${\ensuremath{\omega}}_{0}/t$ is found and a polaron phase diagram is proposed.
arXiv:cond-mat/0011180•Physical review. B, Condensed matter•Jul 15, 2000•35 citations