Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 111: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 111.8: Talk

Friday, March 20, 2015, 11:30–11:45, H 3005

Friedel oscillations at the Mott transition in fermionic systems — •Banhi Chatterjee, Jan Skolimowski, and Krzysztof Byczuk — Institute of Theoretical Physics, Faculty of Physics, University of Warsaw , Warsaw,Poland

Friedel Oscillations (FO) in the Fermi liquid, Mott insulator, and at the Mott transition are studied within one and two dimensional Hubbard model. Electronic correlations are accounted for by solving the dynamical mean-field theory equations, using numerical renormalization group, for infinite homogeneous system. Next the obtained self-energy is transfered into a real-space Dyson equation with the impurity potential. The last problem is solved numerically by exact diagonalization. We observe that in the metallic phase the amplitudes of FO are damped with increasing the interactions while the period remains unchanged. FO almost disappear close to the Mott transition and completely on the insulating side. An additional bound state is observed in the spectral function at the impurity site which splits along with the sub-bands on increasing the interactions.