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Søren Ager Meldgaard

Structure prediction of surface reconstructions by deep reinforcement learning

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We demonstrate how image recognition and reinforcement learning combined may be used to determine the atomistic structure of reconstructed crystalline surfaces. A deep neural network represents a reinforcement learning agent that obtains training rewards by interacting with an environment. The environment contains a quantum mechanical potential energy evaluator in the form of a density functional theory program. The agent handles the 3D atomistic structure as a series of stacked 2D images and outputs the next atom type to place and the atomic site to occupy. Agents are seen to require 1000-10 000 single point density functional theory evaluations, to learn by themselves how to build the optimal surface reconstructions of anatase TiO2(001)-(1 4) and rutile SnO2(110)-(4 1).

Original languageEnglish
Article number404005
JournalJournal of Physics Condensed Matter
Number of pages10
Publication statusPublished - Sep 2020

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