Robust topological surface state against direct surface contamination

Z. K. Liu; Y. L. Chen; J. G. Analytis; S. K. Mo; D. H. Lu; R. G. Moore; I. R. Fisher; Z. Hussain; Z. X. Shen

doi:10.1016/j.physe.2011.10.023

Robust topological surface state against direct surface contamination

Z. K. Liu, Y. L. Chen, J. G. Analytis, S. K. Mo, D. H. Lu, R. G. Moore, I. R. Fisher, Z. Hussain, Z. X. Shen

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21 Scopus citations

Abstract

Angle resolved photoemission spectroscopy (ARPES) study were performed on the (111) surface of topological insulators Bi ₂Te ₃, Bi ₂Se ₃ and semimetals Bi and Sb. In all four materials, we observed clear surface states centered at the Γ point of the surface Brillouin zone. We further studied the evolution of these surface states under controlled surface contamination of CO and O ₂ gas molecules, and found that the surface states in Bi ₂Te ₃ and Bi ₂Se ₃ were both robust against the direct influence of these gas molecules, while the surface states of Bi and Sb could be easily destroyed under the same condition. Our finding provides direct experimental evidence confirming the unusual robustness of the topological surface state of topological insulators with the presence of the time reversal symmetry.

Original language	English
Pages (from-to)	891-894
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	44
Issue number	5
DOIs	https://doi.org/10.1016/j.physe.2011.10.023
State	Published - Feb 2012
Externally published	Yes

Funding

This work was supported by DOE–BES, DMS & E at SLAC ( DE–AC02–76SF00515 ) and ALS ( DE–AC02–05CH1 1231 ).

Funders	Funder number
DMS & E at SLAC	DE–AC02–05CH1 1231, DE–AC02–76SF00515
U.S. Department of Energy
Basic Energy Sciences

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10.1016/j.physe.2011.10.023

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title = "Robust topological surface state against direct surface contamination",

abstract = "Angle resolved photoemission spectroscopy (ARPES) study were performed on the (111) surface of topological insulators Bi 2Te 3, Bi 2Se 3 and semimetals Bi and Sb. In all four materials, we observed clear surface states centered at the Γ point of the surface Brillouin zone. We further studied the evolution of these surface states under controlled surface contamination of CO and O 2 gas molecules, and found that the surface states in Bi 2Te 3 and Bi 2Se 3 were both robust against the direct influence of these gas molecules, while the surface states of Bi and Sb could be easily destroyed under the same condition. Our finding provides direct experimental evidence confirming the unusual robustness of the topological surface state of topological insulators with the presence of the time reversal symmetry.",

author = "Liu, {Z. K.} and Chen, {Y. L.} and Analytis, {J. G.} and Mo, {S. K.} and Lu, {D. H.} and Moore, {R. G.} and Fisher, {I. R.} and Z. Hussain and Shen, {Z. X.}",

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T1 - Robust topological surface state against direct surface contamination

AU - Liu, Z. K.

AU - Chen, Y. L.

AU - Analytis, J. G.

AU - Mo, S. K.

AU - Lu, D. H.

AU - Moore, R. G.

AU - Fisher, I. R.

AU - Hussain, Z.

AU - Shen, Z. X.

PY - 2012/2

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AB - Angle resolved photoemission spectroscopy (ARPES) study were performed on the (111) surface of topological insulators Bi 2Te 3, Bi 2Se 3 and semimetals Bi and Sb. In all four materials, we observed clear surface states centered at the Γ point of the surface Brillouin zone. We further studied the evolution of these surface states under controlled surface contamination of CO and O 2 gas molecules, and found that the surface states in Bi 2Te 3 and Bi 2Se 3 were both robust against the direct influence of these gas molecules, while the surface states of Bi and Sb could be easily destroyed under the same condition. Our finding provides direct experimental evidence confirming the unusual robustness of the topological surface state of topological insulators with the presence of the time reversal symmetry.

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JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 5

ER -

Robust topological surface state against direct surface contamination

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