Comment on 'Unraveling Photoinduced Spin Dynamics in the Topological   Insulator Bi2Se3'
  Comment on a recent paper published in Physical Review Letters by M. C. Wang, S. Qiao, Z. Jiang, S. N. Luo, and J. Qi [Phys. Rev. Lett. 116, 036601 (2016), arXiv:1511.02994v2]. 
Y. D. Glinka
cond-mat.mes-hall