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(a) Cross-sectional HAADF image of a Pd/Bi2Se3 bilayer, taken at the edge of the Pd layer. Inset: optical photo of an as-fabricated Pd/Bi2Se3 bilayer sample, with a scale bar of 10 μm. (b–d) EDX elemental maps of (b) Pd, (c) Bi, and (d) Se of the Pd/Bi2Se3 bilayer.
