Science Advances

This PDF file includes:

• fig. S1. PXRD pattern for the PbSe/Bi₂Se₃ heterostructure.
• fig. S2. HRTEM analysis of the pure Bi₂Se₃ region in the PbSe/Bi₂Se₃ heterostructure.
• fig. S3. Low-magnification representative STEM image of the PbSe/Bi₂Se₃ heterostructure.
• fig. S4. High-magnification representative STEM image of the PbSe/Bi₂Se₃ heterostructure.
• fig. S5. Atomic crystal structure for the intrinsic and expanded Bi₂Se₃ (0001) layers.
• note S1. DFT modeling of PbSe (001)–Bi₂Se₃ (001), PbSe (011)–Bi₂Se₃ (0001), and PbSe (111)–Bi₂Se₃ (0001) interfaces.

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