authors: Satoshi Nishimoto , Eric Jeckelmann , and Florian Gebhard
We present a new numerical method for calculating zero-temperature dynamical correlation functions in impurity models. The method is based on the dynamical density-matrix renormalization group[1]. It allows one to calculate spectral functions for all frequencies with great accuracy and good resolution. The approach is demonstrated on the single-impurity Anderson model. It can be readily extended to different models with several impurities or to the calculation of other dynamical properties.
[1] E. Jeckelmann, Phys. Rev. B 66, 045114 (2002)