2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/20893Recently, observed zero-resistance states are interpreted by Anderson-Brinkman and Phillips as charge density waves. We point out the existence of charge-density waves, superconducting states and new states including a state of zero charge and finite spin.3 pages TeXMesoscale and Nanoscale PhysicsStatistical Mechanicstext