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Session Q12 - DCMP: DENSITY FUNCTIONAL THEORY
Mixed session, Friday morning, March 24, 8:00
Room C1, San Jose Convention Center
We have evaluated the static local field factor G(q) of the electron gas at zero temperature and in the metallic regime by fixed-node diffusion Monte Carlo. In brief, we impose on the electrons an external field v_q and from the sampled electronic energy we extract the static response \chi(q) by fitting in powers of v_q . The computed G(q) smoothly interpolates between the known small and large q behavior, with a crossover around 2q_F . In fact, G(q) appears to be accurately reproduced by the LDA for r_s\alt 2q_F . We give a simple formula to reproduce G(q) at relevant wavevectors.