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Type: Artigo de evento
Title: X-boson Cumulant Approach To The Topological Kondo Insulators
Author: Ramos E.
Franco R.
Silva-Valencia J.
Foglio M.E.
Figueira M.S.
Abstract: In this work we present a generalization of our previous work of the X-boson approach to the periodic Anderson model (PAM), adequate to study a novel class of intermetallic 4f and 5f orbitals materials: the topological Kondo insulators, whose paradigmatic material is the compound SmB6. For simplicity, we consider a version of the PAM on a 2D square lattice, adequate to describe Ce-based compounds in two dimensions. The starting point of the model is the 4f - Ce ions orbitals, with J 5/2 multiplet, in the presence of spin-orbit coupling. Our technique works well for all of the parameters of the model and avoids the unwanted phase transitions of the slave boson mean field theory. We present a critical comparison of our results with those of the usual slave boson method, that has been intensively used to describe this class of materials. We also obtain a new valence first order transition which we attribute to the dependence of the hybridization.
Editor: Institute of Physics Publishing
Rights: aberto
Identifier DOI: 10.1088/1742-6596/568/5/052007
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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