CORRELATION-EFFECTS IN THE COMPTON PROFILE OF SILICON

Ab initio nonlocal pseudopotential variational quantum Monte Carlo tec hniques are used to compute the correlation effects on the valence mom entum density and Compton profile of silicon. Our results for this cas e are in excellent agreement with the Lam-Platzman correction computed within the local density approximation. Within the approximations use d, we rule out valence electron correlations as the dominant source of discrepancies between calculated and measured Compton profiles of sil icon.