Improved Theory of Single-Particle Properties Using Sea-bosons

Details Improved Theory of Single-Particle Properties Using Sea-bosons Improved Theory of Single-Particle Properties Using Sea-bosons

2000-01-21

arxiv.org/abs/cond-mat/0001326v1

Physics

Condensed Matter

approx pages, RevTeX

Scientific paper

In this article, we combine the ideas introduced by us earlier in various proportions to arrive at a simple and yet powerful means of studying single-particle properties of homogeneous Fermi systems in detail without making assumptions regarding the validity or otherwise of Fermi-liquid theory. Novelties include the exact forms of the momentum distribution and spectral functions in the intermediate density regime and a dielectric function that is sensitive to significant qualitative changes in single-particle properties. This time, care is taken to include the particle-hole mode by interpreting the sum over modes as a weighted sum with the dynamical structure factor appearing as the weight.

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