Berlin 2015 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.11: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Nonequilibrium dynamics of the pseudo gap single impurity Anderson model — •Julian Mußhoff1, Christian Kleine2, and Frithjof B. Anders21Forschungszentrum Jülich GmbH, Institute for Advanced Simulation, 52425 Jülich, Germany — 2Technische Universität Dortmund, Lehrstuhl für Theoretische Physik II, 44221 Dortmund, Germany

In the single impurity Anderson model with a pseudo-gap density of states, modeled by a power law ρ(є) ∝ |є|r, a local moment phase and a strong coupling phase are separated by a quantum critical point (QCP). We investigate the real-time dependence of the double occupancy of the impurity due to quenches in one phase and over the QCP using the time-dependent numerical renormalization group (TD-NRG). We show that the double occupancy equilibrates to a steady state for long times. We present a time-dependent perturbation theory which becomes exact at short times. The short-time evolution of our TD-NRG data excellently agrees with this perturbation theory providing an analytical expression of the relevant time scales for the short-time dynamics. We are able to trace back the differences between the results obtained by a time-dependent Gutzwiller variational approach and by the TD-NRG to the wave-function ansatz in the Gutzwiller approach.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2015 > Berlin