title: Transitions from vortex lines to sheets: interplay of topology and dynamics in an anisotropic superfluid.
abstract: In isotropic macroscopic quantum systems vortex lines can be formed while in anisotropic systems also vortex sheets are possible. Based on measurements of superfluid 3He-A, we present the principles which select between these two competing forms of quantized vorticity: sheets displace lines if the frequency of the external drive exceeds a critical limit. The resulting topologically stable state consists of multiple vortex sheets and has much faster dynamics than the state with vortex lines.
authors.affiliation: Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Finland.
authors.forename: V B
authors.initials: VB
authors.lastname: Eltsov
authors.forename: R
authors.initials: R
authors.lastname: Blaauwgeers
authors.forename: N B
authors.initials: NB
authors.lastname: Kopnin
authors.forename: M
authors.initials: M
authors.lastname: Krusius
authors.forename: J J
authors.initials: JJ
authors.lastname: Ruohio
authors.forename: R
authors.initials: R
authors.lastname: Schanen
authors.forename: E V
authors.initials: EV
authors.lastname: Thuneberg