Measurement of intrinsic Dirac fermion cooling on the surface of a topological insulator Bi${}_2$Se${}_3$ using time- and angle-resolved photoemission spectroscopy

Y. H. Wang, D. Hsieh, E. J. Sie +5

We perform time- and angle-resolved photoemission spectroscopy of a prototypical topological insulator Bi${}_2$Se${}_3$ to study the ultrafast dynamics of surface and bulk electrons af…