CUED Publications database

First-principles energetics of water: a many-body analysis

Gillan, MJ and Alfè, D and Bartók, AP and Csányi, G First-principles energetics of water: a many-body analysis. (Unpublished)

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Standard forms of density-functional theory (DFT) have good predictive power for many materials, but are not yet fully satisfactory for solid, liquid and cluster forms of water. We use a many-body separation of the total energy into its 1-body, 2-body (2B) and beyond-2-body (B2B) components to analyze the deficiencies of two popular DFT approximations. We show how machine-learning methods make this analysis possible for ice structures as well as for water clusters. We find that the crucial energy balance between compact and extended geometries can be distorted by 2B and B2B errors, and that both types of first-principles error are important.

Item Type: Article
Uncontrolled Keywords: cond-mat.mtrl-sci cond-mat.mtrl-sci
Divisions: Div C > Applied Mechanics
Depositing User: Unnamed user with email
Date Deposited: 02 Sep 2016 16:32
Last Modified: 22 Oct 2016 23:44