Extended Data Fig. 4: FT-filtered images of the moiré superlattice, Δ₁, and Δ₂ in 1 QL Sb₂Te₃/6 UC FeTe bilayers.

a, Atomic resolution STM image (14 × 14 nm²) acquired simultaneously with the spectroscopic imaging-STM measurements in Fig. 2h,i. b, FT of (a). c-e, FT-filtered images of the moiré superlattice at ±Q₁ (d) and ±Q₂ (e), and their sum (c). f, g, FT-filtered images of Δ₁ at ±Q₁ (f) and ±Q₂ (g). h, i, FT-filtered images of Δ₂ at ±Q₁ (h) and ±Q₂ (i). The gap modulations in (f-i) exhibit phase shifts relative to the moiré superlattice in (d, e), which can also be extracted using the 2D lock-in method (Figs. 2o, p, and S3). Scale bars: 2 nm (a, c-i); 1 Å⁻¹ (b).