### Transport through a Kondo quantum dot: Functional RG approachTransport through a Kondo quantum dot: Functional RG approach

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 Author Schmidt, Holger ♦ Woelfle, Peter Source arXiv.org Content type Text File Format PDF Date of Submission 2009-11-23 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics Subject Keyword Condensed Matter - Strongly Correlated Electrons ♦ physics:cond-mat Abstract We apply the functional renormalization group (FRG) method to calculate the conductance of a quantum dot in the Kondo regime. Starting from the exact FRG equations in Keldysh formulation for the Kondo exchange Hamiltonian in pseudo-fermion (pf) representation, we solve the coupled equations for the pf self energy and the coupling function, neglecting three-particle and higher correlation functions. The conductance $G$ as a function of temperature $T$ and bias voltage $V$ is calculated using a renormalized Golden Rule expression. The limiting behavior at $T$ and/or $V$ $\gg T_{K}$ ($T_{K}$ : Kondo temperature) agrees with known results. The difficulties when approaching strong coupling are analyzed and improvements are suggested. Description Comment: accepted for publication in Ann. Phys. (Berlin) Educational Use Research Learning Resource Type Article