SPECTRAL PROPERTIES OF THE 2D HOLSTEIN T-J MODEL

Employing the Lanczos algorithm in combination with a kernel polynomia l moment expansion (KPM) and the maximum entropy method (MEM), we show a way of calculating charge and spin excitations in the Holstein t-J model, including the full quantum nature of phonons. To analyze polaro n band formation we evaluate the hole spectral function for a wide ran ge of electron-phonon coupling strengths. For the first time, we prese nt results for the optical conductivity of the 2D Holstein t-J model.