2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18028I propose an effective theory of zero-temperature phases of the quantum Hall stipes: a smectic phase where the stripes are static and a novel quantum nematic phase where the positional order is destroyed by quantum fluctuations. The nematic is viewed as a Bose condensate of dislocations whose interactions are mediated by a U(1) gauge field. Collective mode spectrum and the dynamical structure factor in the two phases are calculated.5 pages, 2 figuresMesoscale and Nanoscale Physicstext