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We present a systematic and comprehensive study of finite-size effects indiffusion quantum Monte Carlo calculations of metals. Several previouslyintroduced schemes for correcting finite-size errors are compared for accuracyand efficiency and practical improvements are introduced. In particular, wetest a simple but efficient method of finite-size correction based on anaccurate combination of twist averaging and density functional theory. Ourdiffusion quantum Monte Carlo results for lithium and aluminum, as examples ofmetallic systems, demonstrate excellent agreement between all of the approachesconsidered.

Systematic study of finite-size effects in quantum Monte Carlo calculations of real metallic systems