Correction to: Nature Electronics https://doi.org/10.1038/s41928-018-0021-4, published online 5 February 2018.

In the version of this Article originally published, the author Xiaoqing Pan's two affiliations with the University of California, Irvine, were mistakenly omitted. They are: Department of Chemical Engineering and Materials Science, University of California, Irvine, CA, USA; Department of Physics and Astronomy, University of California, Irvine, CA, USA. These have now been included in the Article.