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arXiv 1105.4658cond-mat.mes-hallcond-mat.mtrl-sci
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三层石墨烯带隙电可调的观测

Observation of an electrically tunable band gap in trilayer graphene

Chun Hung Lui, Zhiqiang Li, Kin Fai Mak, Emmanuele Cappelluti, Tony F. Heinz

摘要:

双层石墨烯的显著特征是通过施加垂直电场在电子态中诱导显著的带隙。较厚的石墨烯层也是非常有吸引力的材料。在这些系统中产生带隙的能力具有很大的基本和实际意义。然而,具有典型ABA层堆叠的石墨烯三层的实验和理论研究都揭示了缺乏任何明显的诱导间隙。在这里,我们将这种行为与具有ABC晶体学堆叠的石墨烯三层所表现出的行为进行对比。该结构的对称性类似于AB堆叠的石墨烯双层的对称性,并且如红外电导率测量所示,允许通过施加的电场形成大的带隙。我们的研究结果表明,关键的和迄今为止被忽视的作用,在几层石墨烯的带隙的诱导晶体堆叠顺序。

英文摘要:

A striking feature of bilayer graphene is the induction of a significant band gap in the electronic states by the application of a perpendicular electric field. Thicker graphene layers are also highly attractive materials. The ability to produce a band gap in these systems is of great fundamental and practical interest. Both experimental and theoretical investigations of graphene trilayers with the typical ABA layer stacking have, however, revealed the lack of any appreciable induced gap. Here we contrast this behavior with that exhibited by graphene trilayers with ABC crystallographic stacking. The symmetry of this structure is similar to that of AB stacked graphene bilayers and, as shown by infrared conductivity measurements, permits a large band gap to be formed by an applied electric field. Our results demonstrate the critical and hitherto neglected role of the crystallographic stacking sequence on the induction of a band gap in few-layer graphene.

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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