A calculation scheme for spectral densities of strongly correlated   electron systems using exact diagonalization of dynamical mean field theory
  A new approach for calculating spectral density functions of strongly correlated electron systems is proposed within the exact diagonalization method of dynamical mean-field theory (DMFT). This approach is based on the analytic continuation of spectral density function obtained by conventional exact diagonalization method of DMFT and its results are more reasonable in shape. As an example of its application, the Mott transition in a strongly correlated electron system is investigated using this new approach. 
Song-Jin O, Hak-Chol Pak, Kwang-Il Ryom and Song-Jin Im
cond-mat.str-el cond-mat.mtrl-sci