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Lee, Seung-Sup B.; Delft, Jan von; Weichselbaum, Andreas (2017): Generalized Schrieffer-Wolff transformation of multiflavor Hubbard models. In: Physical Review B, Vol. 96, No. 24, 245106
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Abstract

We give a self-contained derivation of the low-energy effective interactions of the SU(N) Hubbard model, a multiflavor generalization of the one-bandHubbard model, by using a generalized Schrieffer-Wolff transformation (SWT). The effective interaction of doublons and holons, which has been largely ignored in previous SWT studies (e.g., the t - J model), leads to distinct peaks in the local density of states. As shown by Lee et al. [Phys. Rev. Lett. 119, 236402 (2017)], this underlying effective doublon-holon interaction explains the numerical observation of the subpeaks at the inner edges of the Hubbard bands in the metallic phase close to the Mott transition.