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\begin{document}
\title{DMRG study of the interorbital interaction in the periodic Anderson model}
\author{\underline{I. Hagymási}}
\affiliation{Strongly Correlated Systems "Lendület" Research Group, Institute for Solid State Physics and Optics, MTA Wigner Research Centre for Physics, Budapest H-1525 P.O. Box 49, Hungary}
\affiliation{Department of Theoretical Physics, University of Szeged, Tisza Lajos krt 84-86, H-6720 Szeged, Hungary}
\author{Ö. Legeza}
\affiliation{Strongly Correlated Systems "Lendület" Research Group, Institute for Solid State Physics and Optics, MTA Wigner Research Centre for Physics, Budapest H-1525 P.O. Box 49, Hungary}
\author{J. Sólyom}
\affiliation{Strongly Correlated Systems "Lendület" Research Group, Institute for Solid State Physics and Optics, MTA Wigner Research Centre for Physics, Budapest H-1525 P.O. Box 49, Hungary}
\begin{abstract}
 We investigate an extended periodic Anderson model (EPAM), where besides the standard on-site
$f$-electron interaction
($U_f\sum_{j}\hat{n}^f_{j\uparrow}\hat{n}^f_{j\downarrow}$) there is an
on-site interaction between the $f$- and conduction electrons
($U_{cf}\sum_{j,\sigma,\sigma'}
\hat{n}^f_{j\sigma}\hat{n}^c_{j\sigma'}$).
We apply the density matrix renormalization group algorithm (DMRG) to calculate spin-spin and
density-density correlation functions in the symmetric half-filled EPAM. We show that the the
antiferromagnetic spin correlations are suppressed for increasing $U_{df}$ and the
density-density correlation becomes dominant above a critical value of $U_{df}$. This critical
point is determined by examining the block entropy.
The charge and spin gaps are also calculated for a wide range of parameters and we study other band
fillings as well.

\end{abstract}
\maketitle

\end{document}
