Correction to: Communications Physics, published online 25 June 2019.

The displayed unit of measure of the quantity “a” in the second paragraph of the subsection “Quasiparticle model”. (page 6, right hand column in the PDF version of the article), and in the Supplementary Information document, was misprinted “meV”. The correct unit for “a” throughout the text and supplementary materials is eV. All calculations, figures and interpretation of the results have been done on the basis of the correct unit, and hence all conclusions remain unaffected by this mistake in notation. The authors thank Jan Rothörl for pointing out this error.

The above has been corrected in both the PDF and HTML versions of the Article and the Supplementary Information file has been replaced.