arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.0258cond-mat.mes-hallcond-mat.mtrl-sciphysics.chem-ph
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硼碳氮纳米带中的平带和边态

Appearance of Flat Bands and Edge States in Boron-Carbon-Nitride Nanoribbons

Tomoaki Kaneko, Kikuo Harigaya, Hiroshi Imamura

摘要:

在具有锯齿形边缘的石墨烯纳米带中费米能级处的平带和边缘态的存在是纳米碳材料的最有趣和最吸引人的性质之一,但据信它们是相当脆弱的状态,并且当在边缘周围掺杂B和N原子时消失。本文采用第一性原理计算研究了锯齿形边缘的硼碳氮(BCN)纳米带的电子和磁性。结果表明,BCN纳米带在富氢和贫氢环境中都具有费米能级的平带和边缘态。平面带与锯齿形边缘的石墨烯纳米带相似,但它们之间的电荷和自旋密度分布不同。紧束缚模型和哈伯德模型分析表明,B、N原子与C原子相比,其电荷和自旋密度分布的差异是由于B、N原子的位能不同造成的.

英文摘要:

Presence of flat bands and edge states at the Fermi level in graphene nanoribbons with zigzag edges is one of the most interesting and attracting properties of nanocarbon materials but it is believed that they are quite fragile states and disappear when B and N atoms are doped at around the edges. In this paper, we theoretically investigate electronic and magnetic properties of boron-carbon-nitride (BCN) nanoribbons with zigzag edges where the outermost C atoms on the edges are alternately replaced with B and N atoms using the first principles calculations. We show that BCN nanoribbons have the flat bands and edge states at the Fermi level in both H_2 rich and poor environments. The flat bands are similar to those at graphene nanoribbons with zigzag edges, but the distributions of charge and spin densities are different between them. A tight binding model and the Hubbard model analysis show that the difference in the distribution of charge and spin densities is caused by the different site energies of B and N atoms compared with C atoms.

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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