Heavy Quasiparticles in the Anderson Lattice Model

Details Heavy Quasiparticles in the Anderson Lattice Model Heavy Quasiparticles in the Anderson Lattice Model

1995-11-13

arxiv.org/abs/cond-mat/9511055v1

Physics

Condensed Matter

RevTex. Figures available upon request. To appear in PRL

Scientific paper

10.1103/PhysRevLett.76.279

An exact-diagonalization technique on small clusters is used to study the dynamics of the one-dimensional symmetric Anderson lattice model. Our calculated excitation spectra reproduce key features expected for an infinite Kondo lattice such as nearly localized low-energy spin excitations and extended regions of `heavy-quasiparticle' bands. We show that, in contrast to the hybridization picture, low-energy spin excitations of the nearly-localized $f$-electron system play a key role in the formation of an almost dispersionless low-energy band of heavy quasiparticles.

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