2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/99368We investigate a charged two-dimensional particle in a homogeneous magnetic field interacting with a periodic array of point obstacles. We show that while Landau levels remain to be infinitely degenerate eigenvalues, between them the system has bands of absolutely continuous spectrum and exhibits thus a transport along the array. We also compute the band functions and the corresponding probability current.Final version, to appear in Phys. Lett. A; 10 LaTeX pages with 3 eps figuresCondensed MatterMathematical PhysicsQuantum Physicstext