Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-11-16
Phys. Rev. B 73, 165101 (2006).
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 11 figures
Scientific paper
10.1103/PhysRevB.73.165101
We study spectral properties of quasiparticles in the Kondo lattice model in one and two dimensions including the coherent quasiparticle dispersions, their spectral weights and the full two-quasiparticle spectrum using a cluster expansion scheme. We investigate the evolution of the quasiparticle band as antiferromagnetic correlations are enhanced towards the RKKY limit of the model. In both the 1D and the 2D model we find that a repulsive interaction between quasiparticles results in a distinct antibound state above the two-quasiparticle continuum. The repulsive interaction is correlated with the emerging antiferromagnetic correlations and can therefore be associated with spin fluctuations. On the square lattice, the antibound state has an extended s-wave symmetry.
Grzesik Axel
Monien Hartmut
Sigrist Manfred
Trebst Simon
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