摘要
Shubnikov-de Haas oscillations are the most well-known magneto-oscillations in transport measurements. They are caused by Landau quantization of two-dimensional (2D) electron systems in the presence of a magnetic field. Here we demonstrate that a scanning tunneling microscope (STM) can locally measure similar magneto-oscillations in 2D systems. In Landau level spectroscopy measurements with fine magnetic-field increments, we observed fixed-energy magnetic-field-dependent oscillations of the local density of states. From the measured tunneling magneto-conductance oscillations acquired by STM, energy-momentum dispersions and Berry phases of a monolayer, Bernal-stacked bilayer, and ABC-stacked trilayer graphene were obtained. The reported method is applicable to a wide range of materials because it can obtain the magneto-oscillations of 2D systems larger than the magnetic length; importantly, it also requires no gate electrode.
源语言 | 英语 |
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文章编号 | 287011 |
期刊 | Science China: Physics, Mechanics and Astronomy |
卷 | 64 |
期 | 8 |
DOI | |
出版状态 | 已出版 - 8月 2021 |
已对外发布 | 是 |