000281051 001__ 281051 000281051 005__ 20230426083132.0 000281051 0247_ $$2doi$$a10.1103/PhysRevB.93.035110 000281051 0247_ $$2Handle$$a2128/9805 000281051 0247_ $$2WOS$$aWOS:000367894000001 000281051 0247_ $$2altmetric$$aaltmetric:4876559 000281051 037__ $$aFZJ-2016-00758 000281051 041__ $$aEnglish 000281051 082__ $$a530 000281051 1001_ $$0P:(DE-HGF)0$$aSessi, P.$$b0$$eCorresponding author 000281051 245__ $$aScattering properties of the three-dimensional topological insulator Sb 2 Te 3 : Coexistence of topologically trivial and nontrivial surface states with opposite spin-momentum helicityph 000281051 260__ $$aCollege Park, Md.$$bAPS$$c2016 000281051 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1454320749_19488 000281051 3367_ $$2DataCite$$aOutput Types/Journal article 000281051 3367_ $$00$$2EndNote$$aJournal Article 000281051 3367_ $$2BibTeX$$aARTICLE 000281051 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000281051 3367_ $$2DRIVER$$aarticle 000281051 500__ $$aMissing Journal: Physical Review B (Phys. Rev. B) = 2469-9969 (import from CrossRef) 000281051 520__ $$aThe binary chalcogenides Bi2Te3 and Bi2Se3 are the most widely studied topological insulators. Although the quantum anomalous Hall effect has recently been observed in magnetically doped Sb2Te3, this compound has been studied to a much lesser extent. Here, by using energy-resolved quasiparticle interference mapping, we investigate the scattering events of pristine Sb2Te3 surfaces. We find that, in addition to the Dirac fermions, another strongly spin-polarized surface resonance emerges at higher energies in the unoccupied electronic states. Although the two surface states are of different origin, i.e., topologically protected and trivial, respectively, both show strongly directional scattering properties and absence of backscattering. 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