Correction to: Nature Reviews Physics https://doi.org/10.1038/s42254-021-00344-z, published online 15 July 2021.

In the original version of this article, the colour scheme of Fig 1 was misleading. On page 3, two equations were incorrect, using ε instead of e (electronic charge). The definition \({k}_{{\rm{w}}\parallel }\approx {v}_{{\rm{F}}}{\varepsilon }_{{\rm{F}}}\) was also incorrect, and should read \({k}_{{\rm{F}}\parallel }\approx {v}_{{\rm{F}}}{\varepsilon }_{{\rm{F}}}\). On page 6, the equation \(\upsilon =2({\upsilon }_{1}+\frac{1}{2})=0,\pm 3,\pm 5\cdots \) was incorrect and should be \(\upsilon =2({\upsilon }_{1}+\frac{1}{2})=\pm 1,\pm 3,\pm 5\cdots \).These errors have now been corrected in the HTML and PDF versions of the article.