硒分子吸附於雙層石墨稀之迪拉克錐複製效應

npj 2D Materials and Applications

Meng-Kai Lin, Jun Zhao , Joseph A. Hlevyack, and T.-C. Chiang

硒分子吸附於雙層石墨稀之迪拉克錐複製效應

石墨烯是最廣為人知的迪拉克材料。其中迪拉克錐的線性能帶結構讓材料展現出特殊的電子特性,並在電子元件的應用上非常有價值。於本研究中,我們藉由蒸鍍硒於雙層石墨烯上,發現硒分子於低溫時會藉由物理吸附於雙層石墨稀上,並進一步形成有序結構,此有序結構因為良好的對稱性,將石墨烯的迪拉克錐反折到能帶結構的對稱中心。此研究提出了運用材料界面間微弱的凡德瓦作用調控表面電子結構的新穎機制。

Graphene is a well-known Dirac material. The linear dispersive electronic bands of Dirac cone can foster extraordinary electronic effects, and it is thus of importance in electronic applications. In this work, we show that adsorption of selenium (Se) vapor on bilayer graphene creates a symmetric hybrid clone of the Dirac cones at the zone center at low temperature. The finding illustrates a method to generate electronic features of scientific and technological interests by gentle surface modification via van der Waals adsorption.