Electronic structures of SiC nanoribbons have been studied by spin-polarizeddensity functional calculations. The armchair nanoribbons are nonmagneticsemiconductor, while the zigzag nanoribbons are magnetic metal. The spinpolarization in zigzag SiC nanoribbons is originated from the unpairedelectrons localized on the ribbon edges. Interestingly, the zigzag nanoribbonsnarrower than $\sim$4 nm present half-metallic behavior. Without the aid ofexternal field or chemical modification, the metal-free half-metallicitypredicted for narrow SiC zigzag nanoribbons opens a facile way for nanomaterialspintronics applications.
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