Competition between Hund's coupling and Kondo effect in a one-dimensional extended periodic Anderson model

I. Hagymási, J. Sólyom, O. Legeza

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We study the ground-state properties of an extended periodic Anderson model to understand the role of Hund's coupling between localized and itinerant electrons using the density-matrix renormalization group algorithm. By calculating the von Neumann entropies we show that two phase transitions occur and two new phases appear as the hybridization is increased in the symmetric half-filled case due to the competition between Kondo effect and Hund's coupling. In the intermediate phase, which is bounded by two critical points, we found a dimerized ground state, while in the other spatially homogeneous phases the ground state is Haldane-like and Kondo-singlet-like, respectively. We also determine the entanglement spectrum and the entanglement diagram of the system by calculating the mutual information thereby clarifying the structure of each phase.

Original languageEnglish
Article number035108
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number3
DOIs
Publication statusPublished - Jul 6 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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