Dynamical vertex approximation for nanoscopic systems
arXiv:1003.2630 · doi:10.1103/PhysRevLett.104.246402
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.
4 pages, 2 color printed and 2 color online figures, 1 b&w figure, pdflatex
References in corpus (11)
- The numerical renormalization group method for quantum impurity systems
- Dynamical vertex approximation - a step beyond dynamical mean field theory
- Highly conductive molecular junctions based on direct binding of benzene to platinum electrodes
- Kinks in the dispersion of strongly correlated electrons
- Antiferromagnetic Order of Strongly Interacting Fermions in a Trap: Real-Space Dynamical Mean-Field Analysis
- Sum-rules and bath-parametrization for quantum cluster theories
- High energy kink in the single particle spectra of the two-dimensional Hubbard model
- Kondo decoherence: finding the right spin model for iron impurities in gold and silver
- Correlated electron tunneling through two separate quantum dot systems with strong capacitive interdot coupling
- Kinks in the electronic specific heat
- Nanoscale Dynamical Mean-Field Theory for Molecules and Mesoscopic Devices in the Strong-Correlation Regime