科研之友
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摘要
A particle-hole symmetric Anderson impurity model with ametallic host of narrow bandwidth is studied within the framework of the local moment approach. The resultant single-particle spectra are compared to unrestricted Hartree-Fock, second-order perturbation theory about the noninteracting limit, and Lanczos spectra by Hofstetter and Kehrein. Rather accurate analytical results explain the spectral evolution over almost the entire range of interactions. These encompass, in particular, a rationale for the four-peak structure observed in the low-energy sector of the Lanczos spectra in the moderate-coupling regime. In weak coupling, the spectral evolution is governed by orbital effects, while in the strong-coupling Kondo limit, the model is shown to connect smoothly to the generic Anderson impurity model with a flat and infinitely wide hybridization band.
- 出版日期2011-5-9
