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Local Quasiparticles in the Anderson Model
Author(s) -
Nolting W.,
Oleś A. M.
Publication year - 1981
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221040221
Subject(s) - quasiparticle , anderson impurity model , impurity , condensed matter physics , coupling constant , physics , maxima , density of states , constant (computer programming) , coupling (piping) , spectral line , atomic physics , materials science , quantum mechanics , superconductivity , art , performance art , computer science , programming language , metallurgy , art history
With a new spectral density approach it is shown firstly that the ground state of the Anderson model is nonmagnetic. Local quasiparticles corresponding to transitions between different occupancies of the impurity orbital are shown to be well defined and well separated for realistic values of the parameters of the Anderson model. Lifetimes of the quasiparticles strongly depend on the hybridization coupling constant V d k and are almost independent of temperature. The maxima of the spectral density A dσ (ω) are in qualitative agreement with the results of the optical absorption experiments performed on noble metal alloys containing 3d magnetic impurities.