论文标题
在扭曲的双重双层石墨烯中的Moiré超级晶格上的弱定位
Weak localization on moiré superlattice in twisted double bilayer graphene
论文作者
论文摘要
由Twist堆叠创建的Moiré超级晶格具有多种物理特性。这些物理特性取决于扭曲角度，因此研究扭转角依赖关系对于对Moiré超级晶体中物理现象的深入了解很重要。在这项工作中，由于扭曲的双层石墨烯（TDBG）在扭曲角的函数中研究了由于弱定位（WL）而导致的负磁磁性。 Intervalley散射时间与Intravalley散射时间的比率，使用BiLayer石墨烯的WL公式估算，随着扭曲角度的增加而倾向于减小。由于TDBG的MoiréBrillouin区（BZ）的间隔距离降低了Intervelley距离，因此在定性上解释了此功能。这表明TDBG中的WL对于带有重建的BZ的Moiré超级晶格发生。
Moiré superlattice created by twist stacking has multiple physical properties. These physical properties depend on the twist angle, hence investigation of the twist angle dependency is important for the deep understanding of physical phenomena in moiré superlattice. In this work, negative magnetoresistance owing to weak localization (WL) was investigated in twisted double bilayer graphene (TDBG) as a function of the twist angle. The ratio of the intervalley scattering time to the intravalley scattering time, estimated using the WL formula for bilayer graphene, tended to decrease as the twist angle increased. This feature is qualitatively explained by the enhancement of intervalley scattering due to the reduction of the intervalley distance in the moiré Brillouin zone (BZ) of the TDBG. This indicates that WL in the TDBG occurs for the moiré superlattice with the reconstructed BZ.
