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Advances in Condensed Matter Physics
Volume 2015, Article ID 614017, 5 pages
Research Article

Momentum Distribution Functions in a One-Dimensional Extended Periodic Anderson Model

Strongly Correlated Systems “Lendület” Research Group, Institute for Solid State Physics and Optics, MTA Wigner Research Centre for Physics, P.O. Box 49, Budapest 1525, Hungary

Received 7 May 2015; Accepted 31 August 2015

Academic Editor: Victor V. Moshchalkov

Copyright © 2015 I. Hagymási et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We study the momentum distribution of the electrons in an extended periodic Anderson model, where the interaction, , between itinerant and localized electrons is taken into account. In the symmetric half-filled model, due to the increase of the interorbital interaction, the electrons become more and more delocalized, while the itinerancy of conduction electrons decreases. Above a certain value of the electrons become again localized together with the conduction electrons. In the less than half-filled case, we observe that causes strong correlations between the electrons in the mixed valence regime.