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- W1968141806 abstract "Starting from the exact hierarchy of quantum kinetic equations for the Wigner distribution functions we develop a theory of dynamical correlations in an electron gas. By making a random-phase-approximation- (RPA) like truncation for the second equation in the hierarchy we obtain an expression for the proper polarizability of the form $Q={Q}^{0}+{Q}^{c}$, where ${Q}^{0}$ is the Lindhard (RPA) function and ${Q}^{c}$ is an additional term which has the following properties: (i) it includes all the three first-order Feynman diagrams for the proper polarizability, (ii) it incorporates in addition the coupled propagation of two particle-hole pairs, and (iii) it leads to an expression for the density-density response function which satisfies exactly the first- and third-frequency-moment sum rules. Detailed calculations of plasmon dispersion, damping, and compressibility have been made. Calculations have also been made for the complex dynamic local field $G(k,ensuremath{omega})$ for arbitrary values of wave number and frequency. Comparison has been made with the available experimental data for Al (${r}_{s}=2.0$). A critique of the theory is presented." @default.
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- W1968141806 date "1982-01-15" @default.
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- W1968141806 title "Dynamic correlations in an electron gas. II. Kinetic-equation approach" @default.
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- W1968141806 doi "https://doi.org/10.1103/physrevb.25.561" @default.
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