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arXiv 0712.4130cond-mat.mtrl-sci
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半局域交换关联作用下未掺杂和硼掺杂石墨烯纳米带的半金属性

Half-Metallicity in Undoped and Boron Doped Graphene Nanoribbons in Presence of Semi-local Exchange-Correlation Interactions

Sudipta Dutta, Swapan K. Pati

摘要:

我们进行密度泛函计算一维锯齿形边缘石墨烯纳米带(ZGNRs)的不同宽度,有和没有边缘掺杂,包括半本地交换相关。我们的研究表明,虽然边缘钝化(氢)ZGNRs的基态更倾向于反铁磁,与硼原子的两个边缘的掺杂稳定系统在铁磁基态。局域和半局域交换关联导致在有限的交叉带电场在边缘钝化ZGNRs的半金属性。然而,具有硼边缘的ZGNR即使在没有电场的情况下也显示出与带宽无关的半金属行为,并且这种性质对于任何电场强度都保持不变,这为自旋电子学的应用开辟了巨大的可能性。

英文摘要:

We perform density functional calculations on one-dimensional zigzag edge graphene nano-ribbons (ZGNRs) of different widths, with and without edge doping including semi-local exchange-correlations. Our study reveals that, although the ground state of edge passivated (with hydrogen) ZGNRs prefers to be anti-ferromagnetic, the doping of both the edges with Boron atoms stabilizes the system in a ferromagnetic ground state. Both the local and semi-local exchange-correlations result in half-metallicity in edge passivated ZGNRs at a finite cross-ribbon electric field. However, the ZGNR with Boron edges shows half-metallic behavior irrespective of the ribbon-width even in absence of electric field and this property sustains for any field strength, opening a huge possibility of applications in spintronics.

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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