Infrared electrodynamics and ferromagnetism in the topological semiconductors Bi${}_2$Te${}_3$ and Mn-doped Bi${}_2$Te${}_3$

B. C. Chapler, K. W. Post, A. R. Richardella +4

We report on infrared (IR) optical experiments on Bi${}_2$Te${}_3$ and Mn-doped Bi${}_2$Te${}_3$ epitaxial thin films. In the latter film, dilute Mn doping (4.5\%) of the topologically non…