Abraham, N.L. and Probert, M.I.J. (2006) A periodic genetic algorithm with real-space representation for crystal structure and polymorph prediction. Physical Review B, 73 (22). 224104-6 pages. ISSN 1550-235X
Abstract
A genetic algorithm is described that is suitable for determining the global minimum energy configurations of crystal structures and which can also be used as a polymorph search technique. This algorithm requires no prior assumptions about unit cell size, shape, or symmetry, nor about the ionic configuration within the unit cell. This therefore enables true ab initio crystal structure and polymorph prediction. Our algorithm uses a real-space representation of the population members, and makes use of a periodic cut for the crossover operation. Results on large Lennard-Jones systems with fcc- and hcp-commensurate cells show robust convergence to the bulk structure from a random initial assignment and an ability to successfully discriminate between competing low enthalpy configurations. Results from an ab initio carbon polymorph search show the spontaneous emergence of both Lonsdaleite and graphite-like structures.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | York RAE Import |
Date Deposited: | 26 Feb 2009 10:47 |
Last Modified: | 26 Feb 2009 10:47 |
Published Version: | http://dx.doi.org/10.1103/PhysRevB.73.224104 |
Status: | Published |
Publisher: | The American Physical Society. |
Identification Number: | 10.1103/PhysRevB.73.224104 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:7202 |