# Transforming nonlocality into a frequency dependence: A shortcut to spectroscopy

 Title Transforming nonlocality into a frequency dependence: A shortcut to spectroscopy Publication Type Palaiseau Article Acknowledgements To be filled in Author Address Gatti, M (Reprint Author), Ecole Polytech, Solides Irradies Lab, CNRS, CEA DSM, F-91128 Palaiseau, France. Ecole Polytech, Solides Irradies Lab, CNRS, CEA DSM, F-91128 Palaiseau, France. CNRS, Inst Neel, F-38042 Grenoble, France. Univ Erlangen Nurnberg, Lehrstuhl Theoret Festkorperphys, D-91054 Erlangen, Germany. DOI 10.1103/PhyRevLett.99.057401 Gatti, M, Olevano, V, Reining, L, Tokatly, IV Year of Publication 2007 Journal Phys. Rev. Lett. Volume 99 URL http://dx.doi.org/10.1103/PhyRevLett.99.057401 Keywords paper Abstract Measurable spectra are often derived from contractions of many-body Green's functions. One calculates hence more information than needed. Here we present and illustrate an in principle exact approach to construct effective potentials and kernels for the direct calculation of electronic spectra. In particular, a dynamical but local and real potential yields the spectral function needed to describe photoemission. We discuss for model solids the frequency dependence of this photoemission potential{''} stemming from the nonlocality of the corresponding self-energy. Full Text
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