2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/98693Phonon-assisted tunneling in a double barrier resonant tunneling device can be seen as a resonance in the electron-phonon Fock space which is tuned by the applied voltage. We show that the geometrical parameters can induce a symmetry condition in this space that can strongly enhance the emission of longitudinal optical phonons. For devices with thin emitter barriers this is achieved by a wider collector's barrier.4 pages, 3 figures. Figure 1 changed, typos correctedMesoscale and Nanoscale Physicstext