Volume 88, Number 4, November 2009
Article Number 47004
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 25 November 2009
EPL, 88 (2009) 47004
DOI: 10.1209/0295-5075/88/47004

Coherent and incoherent vortex flow states in crossed channels

C. J. Olson Reichhardt and C. Reichhardt

Theoretical Division, Los Alamos National Laboratory - Los Alamos, NM 87545, USA

received 26 June 2009; accepted in final form 28 October 2009; published November 2009
published online 25 November 2009

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.

74.25.Qt - Vortex lattices, flux pinning, flux creep.

© EPLA 2009