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The accuracy of the energy landscape of silicon systems obtained from variousdensity functional methods, a tight binding scheme and force fields is studied.Quantum Monte Carlo results serve as quasi exact reference values. In additionto the well known accuracy of DFT methods for geometric ground states andmetastable configurations we find that DFT methods give a similar accuracy fortransition states and thus a good overall description of the energy landscape.On the other hand, force fields give a very poor description of the landscapethat are in most cases too rugged and contain many fake local minima and saddlepoints or ones that have the wrong height.

The energy landscape of silicon systems and its description by force  fields, tight binding schemes, density functional methods and Quantum Monte  Carlo methods