Correction to: Nature Communications; https://doi.org/10.1038/s41467-018-07269-9, published online 15 November 2018

The original version of this Article contained an error in Fig. 3, in which the x-axes in Fig. 3e and Fig. 3f were incorrectly labelled ‘Vds’ rather than the correct ‘Vgs’. This has been corrected in both the PDF and HTML versions of the Article.