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Energy landscape of silicon systems and its description by force fields, tight binding schemes, density functional methods, and quantum Monte Carlo methods

Ghasemi, S. Alireza and Amsler, Maximilian and Hennig, Richard G. and Roy, Shantanu and Goedecker, Stefan and Lenosky, Thomas J. and Umrigar, C. J. and Genovese, Luigi and Morishita, Tetsuya and Nishio, Kengo. (2010) Energy landscape of silicon systems and its description by force fields, tight binding schemes, density functional methods, and quantum Monte Carlo methods. Physical Review B, Vol. 81, H. 21 , 214107.

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Official URL: http://edoc.unibas.ch/dok/A5841304

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Abstract

The accuracy of the fundamental properties of the energy landscape of silicon systems obtained from density functional theory with various exchange-correlation functionals, a tight binding scheme, and force fields is studied. Depending on the application, quantum Monte Carlo or density functional theory results serve as quasiexact reference values. In addition to the well-known accuracy of density functional methods for geometric ground states and metastable configurations we find that density functional methods give a similar accuracy for transition states and thus a good overall description of the energy landscape of the silicon systems. On the other hand, force fields give a very poor description of the landscape that are in most cases too rough and contain many spurious local minima and saddle points or ones that have the wrong height.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Physik (Goedecker)
UniBasel Contributors:Goedecker, Stefan
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Institute of Physics
ISSN:0163-1829
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 07:19
Deposited On:14 Sep 2012 06:52

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