Vortex dynamics in high-Tc superconductors with sparse weak columnar defects

We have performed large-scale dynamical simulations on the current-driven three-dimensional frustrated anisotropic XY model with sparse weak columnar defects. Below the matching field, a moving Bose glass phase with superconducting coherence but without spatial order is observed at low temperatures. For very small columnar defect concentrations, a moving Bragg glass phase with both superconducting coherence and hexagonal Bragg peaks can be formed. Both the moving Bose glass and Bragg glass phases dynamically melt into a moving smectic via a first-order phase transition. It is suggested that the proliferation of dislocations mediates the dynamical melting in both cases.