Generalization of the Lindhard dielectric function to include fluctuation effects
The random-phase-approximation dielectric function for the homogeneous electron gas has been derived by Lindhard. Here, we generalize this work to include fluctuation effects, and we also study their influence on the Friedel oscillations. In particular, our generalized function is analytic for all wave vectors and frequencies, in contrast to the Lindhard function. © 1989 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review B
Hu, G., & O'Connell, R. (1989). Generalization of the Lindhard dielectric function to include fluctuation effects. Physical Review B, 40 (6), 3600-3604. https://doi.org/10.1103/PhysRevB.40.3600