论文标题
磁性石墨烯超级晶格中的磁性Bloch传输上的Heteromoiré工程
Heteromoiré Engineering on Magnetic Bloch Transport in Twisted Graphene Superlattices
论文作者
论文摘要
当晶格周期性与磁长度相称时，受施加磁场的局部电子可以重新启动以通过Decalized磁性BLOCH状态（MBS）的晶格自由传播。带有Moiré波长可调性的扭曲石墨烯超级晶格可以以可控的方式实验对独特的离域化的实验访问。在这里，我们报告了高温棕扎克（BZ）振荡的观察和表征，分别是两种类型的1/B和B周期性，源自整数和分数MBS的产生，分别以扭曲的双层和三层石墨烯超级层次。在小角度扭曲的双层石墨烯中显着观察到分配给不同moiré波长的周期性周期性 - 1/b振荡，这可能是由角度降低诱导的平面内杂种杂质级超级叠层引起的。此外，在双吐线三层石墨烯中，异摩尔超级电池的垂直堆叠产生了大型的超级晶格。外来的超级晶格有助于定期振荡，并主导磁性Bloch传输。
Localized electrons subject to applied magnetic fields can restart to propagate freely through the lattice in delocalized magnetic Bloch states (MBSs) when the lattice periodicity is commensurate with the magnetic length. Twisted graphene superlattices with moiré wavelength tunability enable experimental access to the unique delocalization in a controllable fashion. Here we report the observation and characterization of high-temperature Brown-Zak (BZ) oscillations which come in two types, 1/B and B periodicity, originating from the generation of integer and fractional MBSs, in the twisted bilayer and trilayer graphene superlattices, respectively. Coexisting periodic-in-1/B oscillations assigned to different moiré wavelengths, are dramatically observed in small-angle twisted bilayer graphene, which may arise from angle-disorder-induced in-plane heteromoiré superlattices. Moreover, the vertical stacking of heteromoiré supercells in double-twisted trilayer graphene results in a mega-sized superlattice. The exotic superlattice contributes to the periodic-in-B oscillation and dominates the magnetic Bloch transport.
