Current carrying vortex crystals

Magnetic vortex-antivortex crystals generated by spin-polarized current

We study vortex pattern formation in thin ferromagnetic films under the action of strong spin-polarized currents. Considering the currents which are polarized along the normal of the film plane, we determine the critical current above which the film goes to a saturated state with all magnetic moments being perpendicular to the film plane. We show that stable square vortex-antivortex superlattic...

Current-driven vortex dynamics in untwinned YBa2Cu3O7 superconducting single crystals

Current-driven vortex dynamics of type-II superconductors in the weak-pinning limit is investigated by quantitatively studying the current-dependent vortex dissipation of an untwinned YBa2Cu3O7 single crystal. For applied current densities (J ) substantially larger than the critical current density (Jc), non-linear resistive peaks appear below the thermodynamic firstorder vortex-lattice melting...

Experimental evidence of photo-induced vortex crossing in current carrying superconducting strips

Vector vortex solitons in nematic liquid crystals.

We analyze the existence and stability of two-component vector solitons in nematic liquid crystals for which one of the components carries angular momentum and describes a vortex beam. We demonstrate that the nonlocal, nonlinear response can dramatically enhance the field coupling leading to the stabilization of the vortex beam when the amplitude of the second beam exceeds some threshold value....

Relaxation of 2D turbulence to vortex crystals.

In the relaxation of turbulence in nearly inviscid 2D flows, energy flows to long wavelengths, while enstrophy is dissipated on fine scales [1], leading to inviscid invariants that are “fragile” or “robust” in the presence of weak viscosity [2]. Relaxed states can be predicted based on maximization of entropy [3,4] or minimization of enstrophy [5], and surprising agreement with the minimum enst...