<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Sessi, P.</style></author><author><style face="normal" font="default" size="100%">Ruessmann, P.</style></author><author><style face="normal" font="default" size="100%">Bathon, T.</style></author><author><style face="normal" font="default" size="100%">Barla, A.</style></author><author><style face="normal" font="default" size="100%">Kokh, K. A.</style></author><author><style face="normal" font="default" size="100%">Tereshchenko, O. E.</style></author><author><style face="normal" font="default" size="100%">Fauth, K.</style></author><author><style face="normal" font="default" size="100%">Mahatha, S. K.</style></author><author><style face="normal" font="default" size="100%">Valbuena, M. A.</style></author><author><style face="normal" font="default" size="100%">Godey, S.</style></author><author><style face="normal" font="default" size="100%">Glott, F.</style></author><author><style face="normal" font="default" size="100%">Mugarza, A.</style></author><author><style face="normal" font="default" size="100%">Gargiani, P.</style></author><author><style face="normal" font="default" size="100%">Valvidares, M.</style></author><author><style face="normal" font="default" size="100%">Long, N. H.</style></author><author><style face="normal" font="default" size="100%">Carbone, C.</style></author><author><style face="normal" font="default" size="100%">P. Mavropoulos</style></author><author><style face="normal" font="default" size="100%">S. Blügel</style></author><author><style face="normal" font="default" size="100%">Bode, M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Superparamagnetism-induced mesoscopic electron focusing in topological insulators</style></title><secondary-title><style face="normal" font="default" size="100%">PHYSICAL REVIEW B</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2016</style></year><pub-dates><date><style  face="normal" font="default" size="100%">AUG 17</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">7</style></number><volume><style face="normal" font="default" size="100%">94</style></volume><pages><style face="normal" font="default" size="100%">075137</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Recently it has been shown that surface magnetic doping of topological insulators induces backscattering of Dirac states which are usually protected by time-reversal symmetry {[}Sessi et al., Nat. Commun. 5, 5349 (2014)]. Here we report on quasiparticle interference measurements where, by improved Fermi level tuning, strongly focused interference patterns on surface Mn-doped Bi2Te3 could be directly observed by means of scanning tunneling microscopy at 4 K. Ab initio and model calculations reveal that their mesoscopic coherence relies on two prerequisites: (i) a hexagonal Fermi surface with large parallel segments (nesting) and (ii) magnetic dopants which couple to a high-spin state. Indeed, x-ray magnetic circular dichroism shows superparamagnetism even at very dilute Mn concentrations. Our findings provide evidence of strongly anisotropic Dirac-fermion-mediated interactions and demonstrate how spin information can be transmitted over long distances, allowing the design of experiments and devices based on coherent quantum effects in topological insulators.</style></abstract></record></records></xml>