Fig. 4: Gap map with C3 symmetry-breaking along different directions.
From: Directly visualizing nematic superconductivity driven by the pair density wave in NbSe2
a The topography T(r) of AC-CDW region. Scale bar: 0.5 nm. b, The corresponding SC gap map Δ(r). There are two regions (r1 and r2) separated by dashed lines. The petals exhibiting the largest SC gaps, which lead the C3 rotational symmetry-breaking, are denoted by arrows emanating from their centers. Scale bar: 0.5 nm. c Histograms of local averaged SC gap size Δ in areas A1, A2 and A3 within region r1. d Histograms of local averaged SC gap size Δ in areas A1, A2 and A3 within region r2. In (c) and (d), an example of the definition of A1, A2 and A3 is shown in the inset. Vertical dashed lines and numbers indicate the overall averaged gap value for A1, A2 and A3, respectively. Black arrows indicate the ±standard deviation. Experimental setpoints in (a–b): Vs = −4 mV, It = 400 pA.
