2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/98019A vacancy defect is described by a Frenkel--Kontorova model with a discommensuration. This vacancy can migrate when interacts with a moving breather. We establish that the width of the interaction potential must be larger than a threshold value in order that the vacancy can move forward. This value is related to the existence of a breather centred at the particles adjacent to the vacancy.11 pages, 10 figuresPattern Formation and SolitonsMaterials ScienceAdaptation and Self-Organizing Systemstext