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

Hagymási, Imre and Sólyom, Jenő and Legeza, Örs (2015) Competition between Hund's coupling and Kondo effect in a one-dimensional extended periodic Anderson model. PHYSICAL REVIEW B, 92 (3). ISSN 2469-9950

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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 renor- malization 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 inter- mediate 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.

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