  Shubnikov-de Haas (SdH) oscillations, the most well-known
magneto-oscillations caused by the quantization of electron energy levels in
the presence of magnetic fields in two-dimensional (2D) electron systems, can
be used to determine Fermi-surface properties and directly measure the Berry
phase of the 2D systems. It is usually thought that transport measurements are
required to measure the SdH oscillations. Contradicting this belief, we
demonstrate that the SdH oscillations can be measured in graphene systems by
carrying out scanning tunneling spectroscopy (STS) measurements. The
energy-momentum dispersions and Berry phases of monolayer, Bernal-stacked
bilayer, and ABC-stacked trilayer graphene are obtained according to the
measured SdH oscillations in the STS spectra. It is possible to obtain the SdH
oscillations when the size of the 2D systems is larger than the magnetic length
and, importantly, no gate electrode is required in the STS measurement,
therefore, the reported method in this work is applicable to a wide range of
materials.
