Correction to: Nature Communications https://doi.org/10.1038/s41467-019-10477-6, published online 06 June 2019.

The original version of this Article omitted the following from the end of the Acknowledgements: ‘Z.Lu and D.S. acknowledge support from the US Department of Energy (DE-FG02-07ER46451) for magneto-optical measurements performed at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation Cooperative Agreement No. DMR-1644779 and the State of Florida’. This has now been corrected in both the PDF and HTML versions of the Article.