Fig. 2: Movement of Josephson junctions for the measurement of the critical atom number.
From: Quantum interference of currents in an atomtronic SQUID
a Movement of Josephson junctions during the experimental observation of quantum interference. The total duration of the junction movement used to create a bias current was 300 ms with a 3 Hz rotation frequency (Ωext/2π) and a 0.2 Hz frequency for the bias current generation (f). b Variation of z as a function of the number of atoms for two different rotation frequencies with fitting to determine the critical atom number for the atomtronic SQUID of radius 4.82 µm. The red line shows the best fit with a piecewise function of a constant and a straight line with a slope with the blue line indicating the transition point and critical atom number.
