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Density of states of magnetic substitutional impurity-doped graphene in the paramagnetic and ferromagnetic phases

机译:顺磁性和铁磁性相中掺杂磁取代杂质的石墨烯的状态密度

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摘要

We reveal the effects of magnetic substitutional impurities on the density of states (DOS) of a graphene monolayer through the s-f model as well as coherent potential approximation. We show that the magnetic exchange interaction between the itinerant electrons in graphene and magnetic moments leads to ferromagnetic order and spin-splitting band below Curie temperature, which substantially affect the DOS. Furthermore, ferromagnetic graphene exhibits metallic behavior owing to the strong s-f exchange leading to the appearance of a sharp quasiparticle peak near the Fermi level. These phenomena, along with the gaps appearing in the DOS open prospects for new applications in spintronics and optics.
机译:我们通过s-f模型以及相干势近似揭示了磁性替代杂质对石墨烯单层态密度(DOS)的影响。我们表明,石墨烯中的巡回电子与磁矩之间的磁交换相互作用导致居里温度以下的铁磁有序和自旋分裂带,从而大大影响了DOS。此外,由于强的s-f交换,铁磁石墨烯表现出金属行为,导致在费米能级附近出现尖锐的准粒子峰。这些现象以及DOS中出现的空白为自旋电子学和光学的新应用打开了前景。

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