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The evolution of nuclear shell structure is investigated for the first timewithin density-dependent relativistic Hartree-Fock theory and the role of$\pi$-exchange potential is studied in detail. The energy differences betweenthe neutron orbits $\Lrb{\nu1h_{9/2},\nu 1i_{13/2}}$ in the N=82 isotones andbetween the proton ones $\Lrb{\pi1g_{7/2},\pi1h_{11/2}}$ in the Z=50 isotopesare extracted as a function of neutron excess $N-Z$. A kink around $Z = 58$ forthe N=82 isotones is found as an effect resulting from pion correlations. It isshown that the inclusion of $\pi$-coupling plays a central role to providerealistic isospin dependence of the energy differences. In particular, thetensor part of the $\pi$-coupling has an important effect on the characteristicisospin dependence observed in recent experiments.Comment: 4 pages and 4 figure

Evolution of nuclear shell structure due to the pion exchange potential