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We investigated vortex dynamics in a single-crystal sample of type-IIsuperconductor NbSe$_{2}$ using scanning tunneling microscopy at 4.2 K. Thedecay of the magnetic field at a few nT/s in our superconducting magnet inducedthe corresponding motion of vortices at a few pm/s. Starting with an initialmagnetic field of 0.5 T, we continued to observe motion of vortices within afield of view of 400$\times$400 nm$^2$ subject to decay of the magnetic fieldover a week. Vortices moved collectively, and maintained triangular latticesdue to strong vortex-vortex interactions during the motion. However, weobserved two peculiar characteristics of vortex dynamics in thissuperconductor. First, the speed and direction of the vortex lattice motionwere not uniform in time. Second, despite the non-uniform motion, we also foundthat there exists an energetically favored configuration of the moving vorticesin the single-crystal sample of NbSe$_{2}$ based on the overlaid trajectoriesand their suppressed speeds. We model the system with weak bulk pinning, strongbulk pinning, and edge barrier effects.

Nonuniform and coherent motion of superconducting vortices in the picometer-per-second regime