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000825129 0247_ $$2ISSN$$a1094-1622
000825129 0247_ $$2ISSN$$a1095-3795
000825129 0247_ $$2ISSN$$a1098-0121
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000825129 0247_ $$2ISSN$$a2469-9969
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000825129 1001_ $$0P:(DE-HGF)0$$aSessi, P.$$b0$$eCorresponding author
000825129 245__ $$aSuperparamagnetism-induced mesoscopic electron focusing in topological insulators
000825129 260__ $$aWoodbury, NY$$bInst.$$c2016
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000825129 520__ $$aRecently it has been shown that surface magnetic doping of topological insulators induces backscattering of Dirac states which are usually protected by time-reversal symmetry [Sessi et al., Nat. Commun. 5, 5349 (2014)]. Here we report on quasiparticle interference measurements where, by improved Fermi level tuning, strongly focused interference patterns on surface Mn-doped Bi2Te3 could be directly observed by means of scanning tunneling microscopy at 4 K. Ab initio and model calculations reveal that their mesoscopic coherence relies on two prerequisites: (i) a hexagonal Fermi surface with large parallel segments (nesting) and (ii) magnetic dopants which couple to a high-spin state. Indeed, x-ray magnetic circular dichroism shows superparamagnetism even at very dilute Mn concentrations. Our findings provide evidence of strongly anisotropic Dirac-fermion-mediated interactions and demonstrate how spin information can be transmitted over long distances, allowing the design of experiments and devices based on coherent quantum effects in topological insulators.
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000825129 536__ $$0G:(DE-Juel1)jara0078_20131101$$aScattering of topologically protected states off defects in topological insulators (jara0078_20131101)$$cjara0078_20131101$$fScattering of topologically protected states off defects in topological insulators$$x2
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000825129 7001_ $$0P:(DE-HGF)0$$aKokh, K. A.$$b4
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000825129 7001_ $$0P:(DE-HGF)0$$aMahatha, S. K.$$b7
000825129 7001_ $$0P:(DE-HGF)0$$aValbuena, M. A.$$b8
000825129 7001_ $$0P:(DE-HGF)0$$aGodey, S.$$b9
000825129 7001_ $$0P:(DE-HGF)0$$aGlott, F.$$b10
000825129 7001_ $$0P:(DE-HGF)0$$aMugarza, A.$$b11
000825129 7001_ $$0P:(DE-HGF)0$$aGargiani, P.$$b12
000825129 7001_ $$0P:(DE-HGF)0$$aValvidares, M.$$b13
000825129 7001_ $$0P:(DE-Juel1)143632$$aLong, N. H.$$b14
000825129 7001_ $$0P:(DE-HGF)0$$aCarbone, C.$$b15
000825129 7001_ $$0P:(DE-Juel1)130823$$aMavropoulos, P.$$b16
000825129 7001_ $$0P:(DE-Juel1)130548$$aBlügel, S.$$b17
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000825129 77318 $$2Crossref$$3journal-article$$a10.1103/physrevb.94.075137$$bAmerican Physical Society (APS)$$d2016-08-17$$n7$$p075137$$tPhysical Review B$$v94$$x2469-9950$$y2016
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