Two-dimensional Massless Dirac Fermions in Antiferromagnetic AFe2As2 (A = Ba, Sr)

Zhi-Guo Chen, Luyang Wang, Yu Song +7

We report infrared studies of AFe${}_2$As${}_2$ (A = Ba, Sr), two representative parent compounds of iron-arsenide superconductors, at magnetic fields (B) up to 17.5 T. Optical tra…