Interorbital interaction in the one-dimensional periodic Anderson model: A density-matrix renormalization-group study

Hagymási, Imre and Sólyom, Jenő and Legeza, Örs (2014) Interorbital interaction in the one-dimensional periodic Anderson model: A density-matrix renormalization-group study. PHYSICAL REVIEW B, 90 (12). ISSN 2469-9950

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Abstract

We investigate the effect of the Coulomb interaction, Ucf , between the conduction and f electrons in the periodic Anderson model using the density-matrix renormalization-group algorithm. We calculate the excitation spectrum of the half-filled symmetric model with an emphasis on the spin and charge excitations. In the one-dimensional version of the model it is found that the spin gap is smaller than the charge gap below a certain value of Ucf and the reversed inequality is valid for stronger Ucf . This behavior is also verified by the behavior of the spin and density correlation functions. We also perform a quantum information analysis of the model and determine the entanglement map of the f and conduction electrons. It is revealed that for a certain Ucf the ground state is dominated by the configuration in which the conduction and f electrons are strongly entangled, and the ground state is almost a product state. For larger Ucf the sites are occupied alternatingly dominantly by two f electrons or by two conduction electrons.

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