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Electronic Quasiparticles in the Anderson Lattice: Atomic Limit Versus Hybridized Band Picture
Abstract It has been recognized by many authors1–5 that hybridized quasiparticle bands provide an attractive possibility to describe the essential physical features of heavy fermion systems. The quasiparticle description of electronic structure may be qualitatively derived from the phase shifts2 and follows from the slave-boson approach of Coleman3 in the mean-field approximation. Quasiparticle bands were also obtained within the Gutzwiller method by Rice and Ueda4 as well as by Fazekas and Brandow.5 All these findings motivated us to investigate in more detail the microscopic nature of quasiparticle excitations. We start by analyzing the excitation spectrum of the Anderson lattice in the atomic limit. The result found for infinite Coulomb interaction (U=∞) suggests the use of a model spectral density function with two quasiparticle excitations. The quasiparticle weights and energies may be determined from the first moments of the spectral density. In finite bandwidth case it allows to investigate (i) under what circumstances the essential features of the Anderson lattice are reproduced by two hybridized quasiparticle bands, and (ii) how the model parameters are renormalized due to strong correlations.
Electronic Quasiparticles in the Anderson Lattice: Atomic Limit Versus Hybridized Band Picture
Abstract It has been recognized by many authors1–5 that hybridized quasiparticle bands provide an attractive possibility to describe the essential physical features of heavy fermion systems. The quasiparticle description of electronic structure may be qualitatively derived from the phase shifts2 and follows from the slave-boson approach of Coleman3 in the mean-field approximation. Quasiparticle bands were also obtained within the Gutzwiller method by Rice and Ueda4 as well as by Fazekas and Brandow.5 All these findings motivated us to investigate in more detail the microscopic nature of quasiparticle excitations. We start by analyzing the excitation spectrum of the Anderson lattice in the atomic limit. The result found for infinite Coulomb interaction (U=∞) suggests the use of a model spectral density function with two quasiparticle excitations. The quasiparticle weights and energies may be determined from the first moments of the spectral density. In finite bandwidth case it allows to investigate (i) under what circumstances the essential features of the Anderson lattice are reproduced by two hybridized quasiparticle bands, and (ii) how the model parameters are renormalized due to strong correlations.
Electronic Quasiparticles in the Anderson Lattice: Atomic Limit Versus Hybridized Band Picture
Oleś, Andrzej M. (author) / Oleś, Barbara (author)
1987-01-01
4 pages
Article/Chapter (Book)
Electronic Resource
English
Elementary Excitations I: Single Electronic Quasiparticles
| Springer Verlag | 2003
| British Library Online Contents | 2014