Characterization of a correlated topological Kondo insulator in one dimension

• DOI: 10.1103/physrevb.93.165104
• Publication Date: 2016-04-05T18:08:26Z
• Authors: I. Hagymási; Ö. Legeza
• Keywords: Condensed Matter - Strongly Correlated Electrons; Q1 Science (General) / természettudomány általában; Strongly Correlated Electrons (cond-mat.str-el); 0103 physical sciences; FOS: Physical sciences; 01 natural sciences

6 pages, 9 figures<br/>We investigate the ground-state of a p-wave Kondo-Heisenberg model introduced by Alexandrov and Coleman with an Ising-type anisotropy in the Kondo interaction and correlated conduction electrons. Our aim is to understand how they affect the stability of the Haldane state obtained in the SU(2) symmetric case without the Hubbard interaction. By applying the density-matrix renormalization group algorithm and calculating the entanglement entropy we show that in the anisotropic case a phase transition occurs and a N��el state emerges above a critical value of the Coulomb interaction. These findings are also corroborated by the examination of the entanglement spectrum and the spin profile of the system which clarify the structure of each phase.<br/>