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arXiv 0906.2779cond-mat.str-el
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石墨烯中磁性原子的扫描隧道光谱理论

Theory of Scanning Tunneling Spectroscopy of Magnetic Adatoms in Graphene

Bruno Uchoa, Ling Yang, S. -W. Tsai, N. M. R. Peres, A. H. Castro Neto

摘要:

我们从理论上研究了石墨烯中磁性吸附原子的扫描隧道光谱(STS)探测的签名。当吸附原子与两个石墨烯亚晶格等量杂交时,局部吸附原子能级的加宽是反常的,并且可以与能量的立方成比例。与普通金属表面相比,吸附原子的局部矩可以通过探测扫描尖端的接近而被抑制。我们建议,隧道电导的依赖于针尖和吸附原子之间的距离可以提供一个明确的签名的存在局部磁矩。我们还表明,隧穿电导可以区分吸附原子是位于顶部的碳原子或在一个蜂窝六边形的中心。

英文摘要:

We examine theoretically the signatures of magnetic adatoms in graphene probed by scanning tunneling spectroscopy (STS). When the adatom hybridizes equally with the two graphene sublattices, the broadening of the local adatom level is anomalous and can scale with the cube of the energy. In contrast to ordinary metal surfaces, the adatom local moment can be suppressed by the proximity of the probing scanning tip. We propose that the dependence of the tunneling conductance on the distance between the tip and the adatom can provide a clear signature for the presence of local magnetic moments. We also show that tunneling conductance can distinguish whether the adatom is located on top of a carbon atom or in the center of a honeycomb hexagon.

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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