Extended Data Fig. 1: More information about the 1-UC Fe(Te,Se)/STO.
From: Pair density wave state in a monolayer high-Tc iron-based superconductor
a, An STM topography of 1-2 UC Fe(Te,Se)/STO at large-scale (200×200 nm2, Vs = 1 V, Is = 0.5 nA) with terraces of the STO substrate (lighter color means the higher height). The cyan area at the edge of the lower STO terrace shows the 2nd-UC Fe(Te,Se) film. b, Line profile taken along the orange curve in a. The thickness of the 1-UC FeTe1-xSex film is approximately 0.59 nm, corresponding to the composition x ≈ 0.5. c, An STM image of 1-UC Fe(Te,Se)/STO (10×10 nm2, Vs = 0.1 V, Is = 0.5 nA). d, Averaged tunneling spectrum (averaged over ~ 100 spectra) taken along the light grey arrow in c, which shows two pairs of coherence peaks at Δ1 ≈ 11 meV and Δ2 ≈ 19 meV. e, Waterfall-plot of dI/dV curves taken along the light grey arrow in c.
