arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2210.16629cond-mat.mes-hall
收藏

具有面外无序的石墨烯中的电子输运

Electronic transport in graphene with out-of-plane disorder

Yifei Guan, Oleg V. Yazyev

AI总结:

研究石墨烯面外无序缺陷对电子输运的影响,通过紧束缚和密度泛函计算发现晶格共格性是决定背散射抑制的关键,为控制石墨烯输运性质提供指导。

摘要:

实际石墨烯样品通常表现出各种类型的面外无序——波纹、褶皱和折叠——这些是在生长和转移过程中引入的。由石墨烯自粘附与其弯曲刚度相互作用产生的复杂面外缺陷不可避免地导致电荷载流子散射,从而影响石墨烯的电子输运性质。我们利用紧束缚和密度泛函计算研究了面外缺陷模型上的弹道电荷载流子透射,同时充分考虑了晶格弛豫效应。在共格石墨烯褶皱中观察到的透射振荡归因于层内和层间输运通道之间的干涉,而非共格褶皱则表现出消失的背散射,并保留了平直石墨烯的输运性质。背散射的抑制揭示了晶格共格性在电子透射中的关键作用。我们的结果为在存在这种普遍无序的情况下控制石墨烯的输运性质提供了指导。

英文摘要:

Real-world samples of graphene often exhibit various types of out-of-plane disorder -- ripples, wrinkles and folds -- introduced at the stage of growth and transfer processes. These complex out-of-plane defects resulting from the interplay between self-adhesion of graphene and its bending rigidity inevitably lead to the scattering of charge carriers thus affecting the electronic transport properties of graphene. We address the ballistic charge-carrier transmission across the models of out-of-plane defects using tight-binding and density functional calculations while fully taking into account lattice relaxation effects. The observed transmission oscillations in commensurate graphene wrinkles are attributed to the interference between intra- and interlayer transport channels, while the incommensurate wrinkles show vanishing backscattering and retain the transport properties of flat graphene. The suppression of backscattering reveals the crucial role of lattice commensuration in the electronic transmission. Our results provide guidelines to controlling the transport properties of graphene in presence of this ubiquitous type of disorder.

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。

↑