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Density functional and quantum Monte Carlo calculations challenge theexistence of a unique ground state structure for certain Si clusters. For Siclusters with more than a dozen atoms the lowest ten isomers are close inenergy and for some clusters entropic effects can change the energetic orderingof the configurations. Isotope pure configurations with rotational symmetry andsymmetric configurations containing one additional isotope are disfavored bythese effects. Comparisons with experiment are thus difficult since a mixtureof configurations is to be expected at thermal equilibrium

Erratum: Questioning the existence of a unique ground-state structure for Si clusters [Phys. Rev. B75, 085411 (2007)]