期刊
ANNALEN DER PHYSIK
卷 19, 期 1-2, 页码 60-74出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/andp.200910403
关键词
Kondo dot model; electronic transport; functional renormalization group
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 >> T-K (T-K: Kondo temperature) agrees with known results. The difficulties when approaching strong coupling are analyzed and improvements are suggested. (c) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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