Abstract
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.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 11974050, and 11674029). Lin He also acknowledges support from the National Program for Support of Top-notch Young Professionals, the “Fundamental Research Funds for the Central Universities”, and the “Chang Jiang Scholars Program”.
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Local measurements of tunneling magneto-conductance oscillations in monolayer, Bernal-stacked bilayer and ABC-stacked trilayer graphene
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Ren, YN., Zhang, MH., Yan, C. et al. Local measurements of tunneling magneto-conductance oscillations in monolayer, Bernal-stacked bilayer, and ABC-stacked trilayer graphene. Sci. China Phys. Mech. Astron. 64, 287011 (2021). https://doi.org/10.1007/s11433-021-1711-6
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DOI: https://doi.org/10.1007/s11433-021-1711-6