Fig. 3: NDC curves of the 1H layer outside, the 1T layer inside, and the ES of an ET.

a An STM image at \(V=-0.8\,{\rm{V}}\) with indicated positions where STS curves are recorded, using color coded dots. b The STS curves (in corresponding color) for the 1H layer, the edge state (ES) inside, and outside the ET boundary, and the 1T phase inside the ET. The zero level is indicated in each case by a line in the same color code. The STS of the CCDW state of a 1T-TaS2 monocrystal at 4 K is shown for comparison (dotted). c An STS line scan showing the LDOS (color scale) across the ET boundary. The opening of a pseudogap in the 1H polytype is clearly observed, which increases in the 1T layer inside the ET.