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Fermi Level Tuning of Epitaxial Sb2Te3 Thin Films on Graphene by Regulating Intrinsic Defects and Substrate Transfer Doping

High-quality Sb2Te3 films are obtained by molecular beam epitaxy on graphene substrate and investigated by in situ scanning tunneling microscopy/spectroscopy. Intrinsic defects responsible for the natural p-type conductivity of Sb2Te3 are identified to be the Sb vacancies and SbTe antisites in agreement with first-principles calculations. By minimizing defect densities, coupled with a transfer doping by the graphene substrate, the Fermi level of Sb2Te3 thin films can be tuned over the entire range of the bulk band gap. This establishes the necessary condition to explore topological insulator behaviors near the Dirac point.

preprint2011arXivOpen access
Yeping JiangY. Y. SunMu ChenYilin WangZhi LiCanli SongKe HeLili WangXi ChenQi-Kun XueXucun MaS. B. Zhang
cond-mat.mtrl-sci
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Open access12 authors1 topic
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Yeping JiangY. Y. SunMu ChenYilin WangZhi LiCanli SongKe HeLili WangXi ChenQi-Kun XueXucun MaS. B. Zhang

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