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- W1639781369 abstract "We apply the functional field-theory renormalization group (RG) method up to two-loop order to the symmetric single-impurity Anderson model at zero temperature within the wide-band limit. In order to achieve this, we define appropriately a soft ultraviolet regulator in the space of Matsubara frequencies for the renormalized Green's function of the model. We derive analytically and then solve numerically the corresponding integro-differential RG flow equations both for the coupling functions of the model and the quasiparticle weight in the low-energy limit. These equations fully treat the interplay of particle-particle and particle-hole parquet diagrams and also the effect of two-loop self-energy feedback into them. We show that our results correctly reproduce highly accurate numerical renormalization group data from weak to moderate interactions, indicating that the present implementation of the field-theory RG method can be viewed as a reliable quantum impurity solver for this interaction regime. By contrast, for strong interactions the agreement is only qualitative and the exponential suppression of the Kondo scale is still not obtained." @default.
- W1639781369 created "2016-06-24" @default.
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- W1639781369 date "2010-09-21" @default.
- W1639781369 modified "2023-10-18" @default.
- W1639781369 title "Functional field-theory renormalization group approach up to two-loop order for the single-impurity Anderson model" @default.
- W1639781369 hasPublicationYear "2010" @default.
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