Limited robustness of edge magnetism in zigzag graphene nanoribbons with electrodes

作者：Krompiewski S^*

来源：Nanotechnology, 2014, 25(46): 465201.

DOI：10.1088/0957-4484/25/46/465201

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It is shown that apart from well-known factors, like temperature, substrate, and edge reconstruction effects, also the presence of external contacts is destructive for the formation of magnetic moments at the edges of graphene nanoribbons (GNRs). The edge magnetism gradually decreases when graphene/electrode interfaces become more and more transparent for electrons. In addition to the graphene/electrode coupling strength, the aspect ratio parameter, i.e. a width/length ratio of the GNR, is also crucial for the suppression of edge magnetism. The present theory uses a tight-binding method, based on the mean-field Hubbard Hamiltonian for pi electrons, and the Green's function technique within the Landauer-Buttiker approach.

• 出版日期2014-11-21