Simple embedding scheme for the spectral properties of the Single-Impurity Anderson Model

Abstract

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.

8 pages, 9 figures; Results unchanged

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• Comparative study of the density matrix embedding theory for the Hubbard models
• Formation of localized magnetic states in a large-spin Fermi system
• Local Potential Functional Embedding Theory of Molecular Systems: Localized Orbital-Based Embedding from an Exact Density-Functional Perspective
• Degenerate orbital effect in a three orbital periodic Anderson model