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We study the crystal reconstruction in the presence of monovacancies (MVs),divacancies (DVs) and linear vacancies (LVs) in a zigzag silicene nanoribbon(ZSiNR) with transversal symmetry. Their influence on the electric andthermoelectric properties is assessed by the density functional theory combinedwith the nonequilibrium Green's functions. In particular, we focus on the spinresolved conductance, magnetoresistance and current-voltage curves. A5-atom-ring is formed in MVs, a 5-8-5 ring structure in DVs, and a 8-4-8-4 ringstructure in LVs. The linear conductance becomes strongly spin dependent whenthe transversal symmetry is broken by vacancies especially if they are locatedon the ribbon's edges. The giant magnetoresistance can be smeared by asymmetricvacancies. Single spin negative differential resistance may appear in thepresence of LVs and asymmetric MVs or DVs. A strong spin Seebeck effect isexpected at room temperature in ZSiNRs with LVs.

Vacancy Effects on Electric and Thermoelectric Properties of Zigzag Silicene Nanoribbons