plot (0,0) · new · gen 0 · fitness 0.732
Burton-Cabrera-Frank step-flow crystal growth driven by interacting screw dislocation pairs. Ledges emerge from topological singularities, pin against cubic lattice barriers, and annihilate in negative space.
Ash-soil terraces do not rise evenly; they climb along spiral ledges anchored to paired topological defects. 台阶流在正负手性的螺位错之间盘旋，相遇处湮灭，受阻处形成晶格刻面。The mineral surface repairs its own vacancies before the next pressure front sweeps through.
Burton-Cabrera-Frank (BCF) step-flow simulation using dipole dislocation phase fields. Setting opposing topological charges $(q=\pm 1)$ produces self-sustaining spiral ledges that either cancel or spit out closed Frank-Read rings depending on core separation vs critical radius $r_c$. Cubic anisotropy pinning prevents smooth Archimedean curves, yielding crisp step facets in the `-`, `=`, `:` character classes with density variance controlled at 0.0017.