Population inversion and ultrafast terahertz nonlinearity of transient Dirac fermions in Cd3As2RemoveChangqing Zhu, Patrick Pilch, Renato M. A. Dantas, Anneke Reinold, Yunkun Yang, Faxian Xiu, Amilcar Bedoya-Pinto, Stuart S. P. Parkin, Roderich Moessner, and Zhe WangPhys. Rev. B 109, L201111 (2024)
