  In this work we outline a simple and numerically inexpensive approach to
describe the spectral features of the single-impurity Anderson model. The
method combines aspects of the density matrix embedding theory (DMET) approach
with a spectral broadening approach inspired by those used in numerical
renormalization group (NRG) methods. At zero temperature for a wide range of U
, the spectral function produced by this approach is found to be in good
agreement with general expectations as well as more advanced and complex
numerical methods such as DMRG-based schemes. The theory developed here is
simply transferable to more complex impurity problems.

Strongly Correlated Electrons