Coherent and Incoherent Vortex Flow States in Crossed Channels

Details Coherent and Incoherent Vortex Flow States in Crossed Channels Coherent and Incoherent Vortex Flow States in Crossed Channels

2009-06-26

arxiv.org/abs/0906.5004v1

EPL 88, 47004 (2009)

Physics

Condensed Matter

Superconductivity

5 pages, 4 postscript figures

Scientific paper

We examine vortex flow states in periodic square pinning arrays with one row and one column of pinning sites removed to create an easy flow crossed channel geometry. When a drive is simultaneously applied along both major symmetry axes of the pinning array such that vortices move in both channels, a series of coherent flow states develop in the channel intersection at rational ratios of the drive components in each symmetry direction when the vortices can cross the intersection without local collisions. The coherent flow states are correlated with a series of anomalies in the velocity force curves, and in some cases can produce negative differential conductivity. The same general behavior could also be realized in other systems including colloids, particle traffic in microfluidic devices, or Wigner crystals in crossed one-dimensional channels.

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