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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Role of oxidation on surface conductance of the topological insulator Bi2Te2Se

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Title
Role of oxidation on surface conductance of the topological insulator Bi2Te2Se
Author(s)
Jin Heui Hwang; Park, Joonbum; Sangku Kwon; Kim, Jun Sung; Jeong Young Park
Publication Date
2014-12
Journal
SURFACE SCIENCE, v.630, no., pp.153 - 157
Publisher
ELSEVIER SCIENCE BV
Abstract
We investigated the effect of surface oxides on charge transport properties in a topological insulator (Bi2Te2Se)using conductive probe atomic force microscopy in an ultrahigh vacuum environment. Uniform distribution of themeasured friction and current were observed over a single quintuple layer terrace after exposure to the ambient environment,which is an indication of uniformsurface oxide coverage. An oxide-free topological insulator surface was exposed using tip-induced etching. By comparing surface conduction on a fresh surface versus a surface exposed to air,we observed a minor change in resistancewhen surface oxidewas present. The current density varied with applied load on the oxidized surface, which implies that the topological surface states respond to tip-induced pressure even though surface oxide is present. From these results, we conclude that surface oxidation in air has a negligible effect on surface conductance in topological insulators.
URI
https://pr.ibs.re.kr/handle/8788114/834
ISSN
0039-6028
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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