arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.1876cond-mat.mes-hall
收藏

氮化硼-石墨烯混合原子层中的反常绝缘体金属跃迁

Anomalous insulator metal transition in boron nitride-graphene hybrid atomic layers

Li Song, Luis Balicas, Duncan J. Mowbray, Rodrigo B. Capaz, Kevin Storr, Lijie Ci, Deep Jariwala, Stefan Kurth, Steven G. Louie, Angel Rubio, Pulickel M. Ajayan

摘要:

二维电子系统的研究在物理学中具有重要的基础性意义。石墨烯和六方氮化硼(h-BNC)杂化结构的原子层构成了一种新型的二维无序电子系统。在低温下在气相合成的h-BNC原子层中进行的磁电输运测量显示出在冷却时从绝缘到金属行为的清晰和异常的转变。所观察到的绝缘体到金属的转变可以通过电子和空穴掺杂以及通过施加外部磁场来调制。从头计算支持的这些结果表明,这种转变在h-BNC有明显不同的特性相比,其他2D电子系统,是两种不同的机制,即通过金属石墨烯网络和跳跃导电之间的边缘状态随机分布的绝缘h-BN域的渗透共存的结果。

英文摘要:

The study of two-dimensional (2D) electronic systems is of great fundamental significance in physics. Atomic layers containing hybridized domains of graphene and hexagonal boron nitride (h-BNC) constitute a new kind of disordered 2D electronic system. Magneto-electric transport measurements performed at low temperature in vapor phase synthesized h-BNC atomic layers show a clear and anomalous transition from an insulating to a metallic behavior upon cooling. The observed insulator to metal transition can be modulated by electron and hole doping and by the application of an external magnetic field. These results supported by ab-initio calculations suggest that this transition in h-BNC has distinctly different characteristics when compared to other 2D electron systems and is the result of the coexistence between two distinct mechanisms, namely, percolation through metallic graphene networks and hopping conduction between edge states on randomly distributed insulating h-BN domains.

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。

↑