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We study spectral properties of quasiparticles in the Kondo lattice model inone and two dimensions including the coherent quasiparticle dispersions, theirspectral weights and the full two-quasiparticle spectrum using a clusterexpansion scheme. We investigate the evolution of the quasiparticle band asantiferromagnetic correlations are enhanced towards the RKKY limit of themodel. In both the 1D and the 2D model we find that a repulsive interactionbetween quasiparticles results in a distinct antibound state above thetwo-quasiparticle continuum. The repulsive interaction is correlated with theemerging antiferromagnetic correlations and can therefore be associated withspin fluctuations. On the square lattice, the antibound state has an extendeds-wave symmetry.Comment: 8 pages, 11 figure

Quasiparticle dynamics in the Kondo lattice model at half filling