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Using scanning tunneling spectroscopy we have measured the response of Diracelectrons in a magnetic field to the presence of a well-defined smoothlyvarying 1D periodic potential. We find that the lower index Landau levelenergies reliably trace the potential variations, while the higher index levelsappear surprisingly homogeneous. Modeling the effects of the periodic potentialon the Landau level spectra, we show that the Landau level behavior encodesinformation on the spatial extent of the wavefunctions. The lower index mapsreveal Landau level stripes, which would act as traps for chiralone-dimensional modes. Our findings have important implications for transportand magneto-resistance measurements in Dirac materials with engineeredpotential landscapes.

Visualizing Landau levels of Dirac electrons in a one dimensional potential