Journal Article

FZJ-2016-00758

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Scattering properties of the three-dimensional topological insulator Sb 2 Te 3 : Coexistence of topologically trivial and nontrivial surface states with opposite spin-momentum helicityph

Sessi, P. (Corresponding author) ; Storz, O. ; Bathon, T. ; Wilfert, S. ; Kokh, K. A. ; Tereshchenko, O. E. ; Bihlmayer, G.FZJ* ; Bode, M.

2016
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/9805  doi:10.1103/PhysRevB.93.035110

Abstract: The 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. A comparison with ab initio calculations demonstrates that this is a direct consequence of their spin-momentum–locked spin texture which is found to exhibit an opposite rotational sense for the trivial state and the Dirac state.

Note: Missing Journal: Physical Review B (Phys. Rev. B) = 2469-9969 (import from CrossRef)

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)
2. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)

Appears in the scientific report 2016

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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