Fig. 4
Ground-state phase diagram by dual gates. a Sheet resistivity mapping as a function of VTG and VBG measured at T = 40 mK. The colour scale is based on interpolated resistivity. Circles and squares are extracted from the peaks of the second-order derivative calculated using a spline fit of the resistivity-versus-VTG curves. Error bars are defined by the full width of the second derivative peaks. Triangles are the gate voltages at which the resistivity drops to 1% of normal-state resistance. The circles, squares, and triangles indicate the voltages where TP, TF, and TC extrapolate to zero temperature, respectively. The dotted line represents a superconductor–metal phase transition line. Normal state here indicates a non-superconducting state. b Schematics of the four different ground states in the phase diagram. The red arrows represent the superconducting phase of individual puddles. N normal state, S superconducting state
