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Carrier density and magnetism in graphene zigzag nanoribbons

机译:石墨烯之字形纳米带的载流子密度和磁性

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摘要

The influence of carrier density on magnetism in a zigzag graphene nanoribbon is studied in a π-orbital Hubbard-model mean-field approximation. Departures from half filling alter the magnetism, leading to states with charge-density variation across the ribbon and parallel spin alignment on opposite edges. Finite carrier densities cause the spin density near the edges to decrease steadily, leading eventually to the absence of magnetism. At low doping densities the system shows a tendency to multiferroic order in which edge charges and spins are simultaneously polarized.
机译:在π轨道Hubbard模型平均场近似中研究了Z字形石墨烯纳米带中载流子密度对磁性的影响。半填充的偏离改变了磁性,导致带上电荷密度变化且在相对边缘上平行自旋对准的状态。有限的载流子密度会导致边缘附近的自旋密度稳定下降,最终导致没有磁性。在低掺杂密度下,系统显示出多铁性顺序的趋势,其中边缘电荷和自旋同时极化。

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