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arXiv 1306.5049cond-mat.mtrl-sci
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具有奇偶Stone-Wales(5-7对)缺陷的锯齿形氮化硼纳米带的电磁性质

Electronic and Magnetic Properties of Zigzag Boron-Nitride Nanoribbons with Even and Odd-line Stone-Wales (5-7 pair) Defects

Sharma SRKC Yamijala, Swapan K Pati

摘要:

采用自旋极化第一性原理计算,研究了锯齿形氮化硼纳米带(z-BNRs)的自旋极化特性.对于10-zBNNRs,五边形-七边形-缺陷的线数(n)从1变化到8。在我们所研究的不同自旋组态中,我们发现,在每个边缘处具有铁磁有序和反铁磁有序的自旋组态是相当有趣的。对于这种自旋组态,我们发现,如果引入的PH线缺陷是奇数,系统表现为自旋极化半导体,而对于偶数,所有系统都表现出有趣的反铁磁半金属行为。这些结果的稳健性已通过线缺陷位置的变化以及条带宽度的变化[从~ 1.1 nm(6-zBNNR)到~ 3.3 nm(16-zBNNR)]进行了交叉检查。已经完成了态密度(DOS)、投影态密度和能带结构分析,以了解偶线缺陷和奇线缺陷之间存在这些差异的原因。许多观察到的变化的主要原因可以追溯到BNNR边缘性质的变化,这确实决定了系统的性质。

英文摘要:

Spin-polarized first-principles calculations have been performed on zigzag Boron-Nitride Nanoribbons (z-BNNRs) with lines of alternating fused pentagon (P) and heptagon (H) rings (Pentagon-Heptagon-line-defect) at single edge as well as at both edges. The number of line (n) of the Pentagon-Heptagon-defect has been varied from 1 to 8 for 10-zBNNRs. Among the different spin-configurations which we have studied, we find that, the spin-configuration with ferromagnetic ordering at each edge and anti-ferromagnetic ordering across the edges is quite interesting. For this spin-configuration, we find that, if the introduced PH-line-defect is odd numbered, the systems behave as spin-polarized semi-conductors, but, for even numbered, all the systems show interesting anti-ferromagnetic half-metallic behavior. Robustness of these results has been cross checked by the variation of the line-defect position and also by the variation of the width [from ~ 1.1 nm (6-zBNNR) to ~ 3.3 nm (16-zBNNR)] of the ribbon. Density of States (DOS), projected-DOS and band-structure analysis have been accomplished to understand the reasons for these differences between even and odd-line-defects. The main reason for many of the observed changes was traced back to the change in edge nature of the BNNR, which indeed dictates the properties of the systems.

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