Fig. 5.
TDGL simulations of stationary and fast moving vortices at the experimentally accessible velocities. a Calculated Cooper-pair density Δ 2(x, y) of a stationary vortex configuration at applied current density and magnetic field corresponding to the experimental conditions in Fig. 2f. b Corresponding distribution of the supercurrent density |J(x, y)/J d| in the sample showing edge currents in the constriction reaching J d at the verge of vortex penetration. The black arrows point to the local direction of the current. c Time-average of the Cooper-pair density over 5 × 104τGL at I = 1.05I c, revealing branching vortex trajectories coexisting with adjacent stationary vortices. d Snapshot of moving vortices in c with arrows denoting the relative displacement of each vortex following an entry of a new vortex into the sample. e,f Same as c,d but at highest applied current before an additional stem is formed. g Experimental vortex velocity along the stem for B a = 2.7 mT and indicated applied currents with the TDGL data from d and f in normalized units (scaled to v GL = ξ/τ GL). The animation of the vortex flow dynamics corresponding to e,f is presented in Supplementary Videos 5 and 6. The scale bar in a is 20 ξ