Scientific Reports 5: Article number: 16697; published online: 16 November 2015; updated: 14 September 2016

The original Supplementary Information file published with this Article was incorrect. This version included errors in the ‘Calculation of Phonon Coherent Length (CL) in Si/Ge SNW and H-SNW’ section and a number of typographical errors. The correct Supplementary Information file now accompanies the Article.