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The formation of extended electron states in one-dimensional nanostructuresis of key importance for the function of molecular electronics devices. Here westudy the effects of strong electron-phonon interaction on the formation ofextended electronic states in intentionally created Cl vacancy pairs and chainsin a NaCl bilayer on Cu(111). The interaction between the vacancies wastailored by fabricating vacancy pairs and chains of different orientation andseparation with atomic precision using vertical manipulation. Small separationof divacancies led to the formation of symmetric and antisymmetric vacancystates and localized interface-states. By scanning tunneling spectroscopy (STS)we measured their energy splitting and broadening as a function of theinter-vacancy separation. Unexpectedly, the energy splitting between thevacancy states is enlarged by level repulsion resulting from phonon dressing ofthe electronic states, as evidenced by theory. Already for a few coupledvacancies we observe an emerging band structure of the defect band.

Effect of electron-phonon interaction on the formation of one-dimensional electronic states in coupled Cl vacancies