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Spectral function of the Kondo model in high magnetic fields | A. Rosch
; T. A. Costi
; J. Paaske
; P. Wölfle
; | Date: |
8 Dec 2002 | Journal: | Phys. Rev. B 68, 014430 (2003) | Subject: | Strongly Correlated Electrons; Mesoscopic Systems and Quantum Hall Effect | cond-mat.str-el cond-mat.mes-hall | 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. | Source: | arXiv, cond-mat/0301106 | Services: | Forum | Review | PDF | Favorites |
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