Kraft Rainer, Liu Ming-Hao, Selvasundaram Pranauv Balaji, Chen Szu-Chao, Krupke Ralph, Richter Klaus, Danneau Romain
Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe D-76021, Germany.
Institute of Physics, Karlsruhe Institute of Technology, Karlsruhe D-76049, Germany.
Phys Rev Lett. 2020 Nov 20;125(21):217701. doi: 10.1103/PhysRevLett.125.217701.
We consider graphene superlattice miniband fermions probed by electronic interferometry in magnetotransport experiments. By decoding the observed Fabry-Pérot interference patterns together with our corresponding quantum transport simulations, we find that the Dirac quasiparticles originating from the superlattice minibands do not undergo conventional cyclotron motion but follow more subtle trajectories. In particular, dynamics at low magnetic fields is characterized by peculiar, straight trajectory segments. Our results provide new insights into superlattice miniband fermions and open up novel possibilities to use periodic potentials in electron optics experiments.
我们考虑在磁输运实验中通过电子干涉测量法探测的石墨烯超晶格微带费米子。通过将观察到的法布里 - 珀罗干涉图案与我们相应的量子输运模拟相结合进行解码，我们发现源自超晶格微带的狄拉克准粒子不会经历传统的回旋运动，而是遵循更微妙的轨迹。特别是，低磁场下的动力学特征是奇特的直线轨迹段。我们的结果为超晶格微带费米子提供了新的见解，并为在电子光学实验中使用周期性势开辟了新的可能性。
