Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Correlated Electrons: Quantum Impurities, Kondo Physics
TT 30.7: Vortrag
Dienstag, 21. März 2017, 15:30–15:45, HSZ 03
The spinless Anderson-Holstein impurity model — •Andisheh Khedri1,2, Volker Meden1,2, and Theo Costi2 — 1RWTH Aachen Univercity — 2Forschungszentrum Jülich
We consider a spinless resonant level in a wide conduction band which is coupled to a phonon mode. This coupling induces an effective retarded and attractive electron-electron interaction which leads to a suppression of the tunneling rate from the local level to the conduction sea. Conventional perturbation theory in the coupling strength does neither capture the underlying polaron physics nor the power-law like renormalization as known from the purely fermionic interacting resonant level model (anti-adiabatic limit). We use the functional renormalization group to study the renormalization of the tunneling rate for arbitrary bare rate and phonon frequency in the limit of small to intermediate electron-phonon coupling. We compare to results obtained by the numerical renormalization group.