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• W2046851144 abstract "Using a recently developed perturbative renormalization group (RG) scheme, we calculate analytically the spectral function of a Kondo impurity for either large frequencies w or large magnetic field B and arbitrary frequencies. For large w >> max[B,T_K] the spectral function decays as 1/ln^2[ w/T_K ] with prefactors which depend on the magnetization. The spin-resolved spectral function displays a pronounced peak at w=B with a characteristic asymmetry. In a detailed comparison with results from numerical renormalization group (NRG) and bare perturbation theory in next-to-leading logarithmic order, we show that our perturbative RG scheme is controlled by the small parameter 1/ln[ max(w,B)/T_K]. Furthermore, we assess the ability of the NRG to resolve structures at finite frequencies." @default.
• W2046851144 created "2016-06-24" @default.
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• W2046851144 date "2003-07-29" @default.
• W2046851144 modified "2023-09-24" @default.
• W2046851144 title "Spectral function of the Kondo model in high magnetic fields" @default.
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• W2046851144 doi "https://doi.org/10.1103/physrevb.68.014430" @default.
• W2046851144 hasPublicationYear "2003" @default.
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