fig4

Figure 4. Controllable superconducting diode. The top panel displays the square-wave excitation applied at 2 K with an amplitude of 340 μA (between I_c⁺ and |I_c^-|) under a magnetic field of 0.2 mT. The coincidentally measured junction voltage is presented in the bottom panel. In this depiction, the blue shaded region represents the superconducting state, where the voltage remains zero under negative current bias. Conversely, the white region signifies the normal state, with a high voltage observed during positive current bias. The red dotted line denotes the zero line.