Tomić Petar, Rickhaus Peter, Garcia-Ruiz Aitor, Zheng Giulia, Portolés Elías, Fal'ko Vladimir, Watanabe Kenji, Taniguchi Takashi, Ensslin Klaus, Ihn Thomas, de Vries Folkert K
Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland.
National Graphene Institute, University of Manchester, Manchester M13 9PL, United Kingdom.
Phys Rev Lett. 2022 Feb 4;128(5):057702. doi: 10.1103/PhysRevLett.128.057702.
A unique feature of the complex band structures of moiré materials is the presence of minivalleys, their hybridization, and scattering between them. Here, we investigate magnetotransport oscillations caused by scattering between minivalleys-a phenomenon analogous to magnetointersubband oscillations-in a twisted double bilayer graphene sample with a twist angle of 1.94°. We study and discuss the potential scattering mechanisms and find an electron-phonon mechanism and valley conserving scattering to be likely. Finally, we discuss the relevance of our findings for different materials and twist angles.
莫尔材料复杂能带结构的一个独特特征是存在微谷、它们之间的杂化以及相互之间的散射。在此，我们研究了在扭转角为1.94°的扭转双双层石墨烯样品中，由微谷之间的散射引起的磁输运振荡——这一现象类似于磁子带间振荡。我们研究并讨论了潜在的散射机制，发现电子 - 声子机制和谷守恒散射很可能存在。最后，我们讨论了我们的发现对于不同材料和扭转角的相关性。
