Abstract
The occupation number densities N ( k ) s of Li and Na are obtained from a first-principle calculation of the spectral function within the GW approximation. The dielectric matrix needed to form the screened potential W is computed within the random-phase approximation. The Compton profiles (CPs) of Li and Na are computed using the N ( k ) s. The computed CPs are in very close agreement with the results of recent high-resolution CP experiments. The renormalization factors on the Fermi surface Z F s are estimated for Li along the three principal symmetry directions. Although the Z F s are significantly smaller compared to those obtained so far using jellium models, they compare well with those evaluated from recent experimental CPs.
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