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  • Title: Dynamical vertex approximation for nanoscopic systems.
    Author: Valli A, Sangiovanni G, Gunnarsson O, Toschi A, Held K.
    Journal: Phys Rev Lett; 2010 Jun 18; 104(24):246402. PubMed ID: 20867318.
    Abstract:
    With an increasing complexity of nanoscopic systems and the modeling thereof, new theoretical tools are needed for a reliable calculation of complex systems with strong electronic correlations. To this end, we propose a new approach based on the recently introduced dynamical vertex approximation. We demonstrate its reliability already on the one-particle vertex (i.e., dynamical mean field theory) level by comparison with the exact solution. Modeling a quantum point contact with 110 atoms, we show that the contact becomes insulating already before entering the tunneling regime due to a local Mott-Hubbard transition occurring on the atoms which form the point contact.
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