Stillinger-Weber potential for brittle Si due to Hauch et al. (1999) v005

Amit Singh, Jens Hauch, Dominic Holland, Michael Marder & Harry Swinney
This is a Stillinger-Weber (SW) paramaterization for Si due to Hauch et al. (1999). In this model, the original SW lambda value is doubled from 21.0 to 42.0 in order to obtain brittle behavior in fracture. The original SW parameterization for Si exhibits ductile behavior.
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