Recent theory on magnetically doped topological insulators predicts that quantum corrections Δκ to the temperature dependence of conductivity can change sign across the Curie transition [PRL. 112, 146601 (2014)]. The change is attributed to a suppression of the Berry phase of the topological surface state, caused by a magnetic energy gap. We demonstrate that a sign change can appear at a constant Berry phase and resolve contradictions by extending theory to a nonmonotonic temperature scaling of inelastic scattering lengths showing a turning point at the Curie transition.
Contact: Jan Honolka
Collaborating institutions: Department of Physics and Astronomy, Interdisciplinary Nanoscience Center (INANO), University of Aarhus, Aarhus Denmark, Département de Physique, Institut Quantique, Université de Sherbrooke, Sherbrooke, Canada, Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Linz, Austria, Department of Physics, University of Hamburg, Germany, Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic