Official websites use .gov
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.gov website belongs to an official
government organization in the United States.
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The dashed lines represent different interfaces (Red: Amorphous Te capping layer/TI film; Green: 1QL Bi2Se3/19 QLs Bi2Te3; Yellow: TI film/sapphire substrate). Scale bars are 5 nm (a), 1 nm (b), 1 nm (c).
