Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 53: Quantum Impurities and Kondo Physics
TT 53.3: Talk
Wednesday, March 14, 2018, 10:00–10:15, HFT-FT 131
The role of impurities in model correlated fermionic systems — •Banhi Chatterjee1, 2, Jan Skolimowski1, 3, and Krzysztof Byczuk1 — 1Institute of Theoretical Physics, Warsaw University, Warsaw, Poland — 2Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic — 3Jozef Stefan Institute, Ljubljana, Slovenia
The role of impurities and resulting Friedel Oscillations (FO) in the Fermi liquid phase, Mott insulating phase, and at the Mott transition is studied in fermionic lattice models at zero temperature. We consider the case of two impurities which is aimed to simulate the effect of defects and dopants in real lattices. A comparative picture with the single impurity case is also presented. Electronic correlations are accounted for by including the local self-energy term from the homogeneous dynamical mean-field theory calculations. Interference effects due to the additional impurity on FO is seen which reduces with the interaction and also the relative distance between the impurities. The position of interference maxima and minima are not changed by the interactions. In the metallic phase the amplitudes of FO are damped with increasing the interactions while the period remains unchanged at half-filling. FO almost disappear close to the Mott transition and completely beyond it in all the cases. The screening effects, quantified by the screening charge are discussed. The effects of interference on the spectral functions are also shown.