Correction to: Nature Photonics https://doi.org/10.1038/s41566-019-0577-1, published online 20 January 2020.

In the version of this Letter originally published, the author Aram Amassian was incorrectly affiliated with ‘KAUST Solar Center (KSC), and Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia’ instead of ‘Materials Science and Engineering, North Carolina State University, Raleigh, NC, USA’. This affiliation has now been added, and other footnotes renumbered accordingly, in the online versions of the Letter.