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The local electronic states around a single As (Te, Se) vacancy areinvestigated in order to shed light on the role of ligands in a series ofiron-based superconductors. Such a vacancy can produce a local hoppingcorrection ranging from $-0.22$ eV to 0.12 eV and always induce two in-gapresonance peaks in the local density of states (LDOS) at the fixed symmetricalbias voltages, which are rather robust and irrelevant to the phase ofsuperconducting order parameter. The LDOS images near the defect predominantlypossess $0^o$ and $45^o$ stripes. These energy-dependent charge modulationscreated by quasiparticle interference are originated in the nesting effectbetween the inner (outer) hole Fermi surface around $\Gamma$ point and theinner (outer) electron Fermi surface around $M$ point.

Nesting-induced Local Electronic Patterns around a Single As (Te, Se) Vacancy in Iron-based Superconductors