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Response of the topological surface state to surface disorder in TlBiSe2

AuthorsPielmeier, Florian; Landolt, Gabriel; Slomski, Bartosz; Muff, Stefan; Aliev, Ziya S.; Osterwalder, Jürg; Chulkov, Eugene V. ; Dil, J. Hugo
KeywordsAngle resolved photoemission spectroscopy
Atomic force microscopy
Scanning tunneling microscopy
Topological insulator
Topological surface state
Issue Date2015
PublisherInstitute of Physics Publishing
CitationNew Journal of Physics 17: 023067 (2015)
AbstractThrough a combination of experimental techniques we show that the topmost layer of the topological insulator TlBiSe2 as prepared by cleavage is formed by irregularly shaped Tl islands at cryogenic temperatures and by mobile Tl atoms at room temperature. No trivial surface states are observed in photoemission at low temperatures, which suggests that these islands cannot be regarded as a clear surface termination. The topological surface state is, however, clearly resolved in photoemission experiments. This is interpreted as direct evidence of its topological self-protection and shows the robust nature of the Dirac cone-like surface state. Our results can also help explain the apparent mass acquisition in S-doped TlBiSe2.
DescriptionContent from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.-- et al.
Publisher version (URL)http://dx.doi.org/10.1088/1367-2630/17/2/023067
Identifiersdoi: 10.1088/1367-2630/17/2/023067
issn: 1367-2630
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