ISSN:
1573-7357
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract A model for calculating the interactions in arbitrarily spin-polarized Fermi systems is presented. Starting from the four-point vertex functions, the “induced” part of the interactions is deduced by explicitly treating the one-particle, one-hole irreducible diagrams and using some general crossing symmetry relations. Extrapolation away from the Fermi surface is carried out by replacing the particle-hole phase space by Lindhard functions in the “crossed” channel; consequently, calculation of the necessary ↑-↓ phase space function is presented. The longitudinal spin-density and density responses for polarized systems are obtained by diagrammatic means. A possible way of treating the “direct” part of the interactions using Born approximation is also discussed. Finally, the limits of the model for zero and full polarization are given.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00682568
