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arXiv 1107.5345cond-mat.mes-hall
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垂直电场作用下的多层石墨烯纳米结构

Multilayer graphene nanoribbon under vertical electric field

S. Bala kumar, Jing Guo

摘要:

研究了垂直电场对多层扶手椅型石墨烯纳米结构(aGNR)电子性质的影响。在电场作用下,双层aGNR的能带结构发生了有趣的变化,如电子速度、电子有效质量的符号、带隙、带隙在动量空间中的位置等的变化。根据aGNR的宽度和所施加的电场,aGNR的带隙可以增加或减小。当所施加的电场高于临界值时,双层aGNR的带隙与双层石墨烯的带隙相同,而与宽度无关。我们还表明,对于半导体多层aGNR与两个以上的层,带隙随电场的增加而减小,导致在一个半导体金属过渡。这可以用于增强基于石墨烯的晶体管器件的性能。

英文摘要:

We study the effect of vertical electric-field (E-field) on the electronic properties of the multilayer armchair graphene nanoribbon (aGNR). Under E-field, the band structure of a bilayer aGNR undergoes interesting transformations such as change in the electron velocity, sign of the electron effective mass, band gap, the position of the band gap in the momentum space. Depending on the width of the aGNR and the applied E-field, the band gap of the aGNR may either be increased or decreased. When the applied E-field is above a critical value, the band gap of the bilayer aGNR is identical to that of the bilayer graphene, independent of the width. We also show that, for semiconducting multilayer aGNR with more than two layers, the band gap decreases with increasing E-field, resulting in a semiconductor-to-metallic transition. This can be utilized to enhance the performance of a graphene based transistor devices.

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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