论文标题
石墨烯中的电子传输和面外障碍
Electronic transport in graphene with out-of-plane disorder
论文作者
论文摘要
石墨烯的现实世界样品通常在生长和转移过程的阶段引入各种类型的平面障碍 - 波纹，皱纹和褶皱。这些复杂的平面外缺陷是由于石墨烯的自我粘附及其弯曲刚度之间的相互作用导致的，不可避免地会导致电荷载体的散射，从而影响石墨烯的电子传输特性。我们使用紧密结合和密度功能计算，同时完全考虑了晶格松弛效果，以解决平面外缺陷模型之间的弹道电荷载体传输。相应的石墨烯皱纹中观察到的透射振荡归因于内层和间层中传输通道之间的干扰，而不一致的皱纹则显示出消失的反向散射并保留了平坦石墨烯的传输特性。反向散射的抑制揭示了晶格特征在电子传输中的关键作用。我们的结果提供了在这种无处不在的疾病存在下控制石墨烯的运输特性的指南。
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.
