2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/114960When an open string ends with charges on a D2-brane, which involves constant background magnetic field perpendicular to the brane, we construct the spectrum-generating algebra for this charged string, which assures that our system is ghost-free under some conditions. The application to the Hall effect for charged strings is also shortly remarked.6 pagesHigh Energy Physics - Theorytext