Berlin 2012 – wissenschaftliches Programm
MA 22.8: Vortrag
Mittwoch, 28. März 2012, 11:30–11:45, EB 301
Influence of magnetic impurities on doping and scattering properties of topological surface states: Fe on Bi2X3 (X=Te, Se) — •Markus R. Scholz1, J. Sánchez-Barriga1, D. Marchenko1, A. Varykhalov1, E. Rienks1, A. Volykhov2, L. V. Yashina2, and O. Rader1 — 1Helmholtz-Zentrum Berlin — 2Moscow State University
We study the effect of Fe impurities deposited on the surface of the topological insulators Bi2Se3 and Bi2Te3 by means of photoelectron spectroscopy. The topological surface state reveals surface electron doping when the Fe is deposited at room temperature and hole doping when deposited at low temperture (∼10 K). We show that in both cases the topological surface state remains intact and gapless. We analyze the line broadening for pure Bi2X3 (X=Se, Te) and after deposition of Fe. We observe that the constant broadening in the bulk band gap range increases by a factor of 2 upon deposition of Fe. Because we deposit the Fe without electron doping, this result is not due to a gain in warping as was recently suggested. We discuss the results based on different types of scattering mechanisms.