Extended Data Fig. 4: Tip–sample distance-dependent dI/dV spectrum tracking the evolution of Andreev reflection signal.
From: Resolving intervalley gaps and many-body resonances in moiré superconductors
a, Point-contact dI/dV spectra taken as the tip approaches the sample. b, VGate-dependent point-contact dI/dV spectroscopy taken on MATTG device #1 at twist angle θ = 1.61°. Andreev reflection signal is visible between filling factor ν = −2 to −3. c,d, dI/dV map measured on the same region with different STM tip feedback conditions. VBias = 100 mV and Iset = 1 nA for c and VBias = 100 mV and Iset = 20 pA for d. Tip–sample distance is shorter by 0.9 nm for c compared with d.
