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Using low-temperature high-magnetic-field scanning tunneling microscopy andspectroscopy (STM/STS), we systematically study a graphene quantum dot (GQD)defined by a circular graphene p-p junction. Inside the GQD, we observe aseries of quasi-bound states arising from whispering-gallery-mode (WGM)confinement of the circular junction and directly visualize these quasi-boundstates down to atomic dimensions. By applying a strong magnetic field, a largejump in energy of the quasi-bound states, which is about one-half the energyspacing between the quasi-bound states, is observed. Such a behavior resultsfrom turning on a {\pi} Berry phase of massless Dirac fermions in graphene by amagnetic field. Moreover, our experiment demonstrates that a quasi-bound statesplits into two peaks with an energy separation of about 26 meV when the Fermilevel crosses the quasi-bound state, indicating that there are strongelectron-electron interactions in the GQD.

Scanning tunneling microscope characterizations of a circular graphene resonator realized with p-p junctions