Owing to its hexagonal lattice structure with a diatomic unit ... at energies ±ℏv F |G|/2 given by the reciprocal superlattice vectors G(refs 2, 3), where v F is the Fermi velocity.

By finely varying a magnetic field applied perpendicularly to the thin plate, the researchers were able to induce a transformation between the square lattice of merons-antimerons and a hexagonal ...