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arXiv 1803.00295cond-mat.mes-hallcond-mat.mtrl-sci
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利用RKKY交换作用探测锯齿形磷烯纳米微粒的边缘态

Probing the edge states in a zigzag phosphorene nanoribbon via RKKY exchange interaction

SK Firoz Islam, Paramita Dutta, A. M. Jayannavar, Arijit Saha

摘要:

磷烯是磷原子的各向异性褶皱二维($2$ D)六方晶格。锯齿形磷烯纳米颗粒(ZPNR)中的边缘模是准平坦的,与体相态完全隔离,这与其他六方晶格如石墨烯、硅烯等相比是独特的。我们从理论上研究了置于纳米颗粒上的两个磁性杂质之间的Ruderman-Kittel-Kasuya-Yosida(RKKY)交换相互作用,并通过其行为提取平坦边缘态的特征。由于边缘态与体相完全分离,我们可以通过调整外部栅极电势,将通过RKKY相互作用的边缘模式贡献与体的边缘模式贡献隔离,相同的边缘。体诱导RKKY相互作用表现出非常平滑的振荡与两个杂质之间的距离,而边缘模式,它波动非常迅速。我们还探讨了拉伸应变的影响,在没有和存在的栅极电压,并揭示了RKKY相互作用强度可以在适当的掺杂下,当两个杂质是在体。

英文摘要:

Phosphorene is an anisotropic puckered two-dimensional ($2$D) hexagonal lattice of phosphorus atoms. The edge modes in a zigzag phosphorene nanoribbon (ZPNR) are quasi-flat in nature and fully isolated from the bulk states, which are unique in comparison to the other hexagonal lattices like graphene, silicene etc. We theoretically investigate the Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction between two magnetic impurities placed on the nanoribbon, and extract the signatures of the flat edge states via the behavior of it. Due to the complete separation of the edge states from the bulk, we can isolate the edge mode contribution via the RKKY interaction from that of the bulk by tuning the external gate potential when both the impurities are placed at the same edge. The bulk induced RKKY interaction exhibits very smooth oscillation with the distance between the two impurities, whereas for edge modes it fluctuates very rapidly. We also explore the effect of tensile strain both in absence and presence of gate voltage and reveal that the RKKY interaction strength can be boosted under suitable doping, when both the impurities are within the bulk.

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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