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arXiv 1801.07540cond-mat.mes-hall
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聚苯胺(C_{3} N)纳米带:磁性金属、半导体和半金属

Polyaniline (C_{3}N) nanoribbons: Magnetic metal, Semiconductor, and Half-Metal

Meysam Bagheri Tagani, Sahar Izadi Vishkayi

摘要:

最近合成了二维聚苯胺片,发现它是一种具有间接带隙的半导体。采用密度泛函理论研究了聚苯胺二维片(C3 N片)分解后的聚苯胺纳米带。在带的边缘存在氮原子增加了带的稳定性和磁化强度,使其不同于石墨烯纳米带。不饱和纳米带是磁性金属,因此扶手椅型C3N纳米带在反铁磁状态下是无间隙自旋半导体,而在铁磁状态下是半金属。氢钝化C_3N纳米带边缘原子后,观察到从金属到半导体的转变。氢饱和的扶手椅型C3N纳米带的带隙可以使用外部横向电场来控制,使得其大小取决于电场的方向。在氢饱和的锯齿形C3N纳米带中是金属还是半导体强烈依赖于边缘原子,使得仅在两个边缘中具有氮原子的带是半导体。外部电场不能在锯齿形纳米带中诱导任何自旋极化,这与在锯齿形纳米带中观察到的相反。

英文摘要:

Two-dimensional polyaniline sheet has been recently synthesized and found that it is a semiconductor with indirect band gap. Polyaniline nanoribbons decomposed from two-dimensional polyaniline sheet (C3N sheet) are investigated using density functional theory. The existence of nitrogen atoms in the edge of the ribbons increases stability and magnetization of the ribbons and make them different from graphene nanoribbons. Unsaturated nanoribbons are magnetic metals so that armchair C3N nanoribbons are gap-less spin semicon- ductors in the antiferromagnetic state and half-metals in the ferromagnetic state. A transition from metal to semiconductor is observed in the armchair C3N nanoribbons when the edge atoms are passivated by hy- drogen. The band gap of hydrogen saturated armchair C3N nanoribbons can be controlled using an external transverse electric field so that its magnitude is dependent on the direction of the electric field. Being metal or semiconductor in hydrogen saturated zigzag C3N nanoribbons is strongly dependent on the edge atoms so that just ribbons having nitrogen atoms in both edges are semiconductor. An external electric field cannot induce any spin polarization in the zigzag nanoribbons which is in contrast with what was observed in zigzag

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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