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Long-wavelength local density of states oscillations near graphene step edges
Jiamin Xue1, Javier Sanchez-Yamagishi, K Watanabe
1Department of Physics, University of Arizona, Tucson, Arizona 85721 USA.
Abstract:
Using scanning tunneling microscopy and spectroscopy, we have studied the local density of states (LDOS) of graphene over step edges in boron nitride. Long-wavelength oscillations in the LDOS are observed with maxima parallel to the step edge. Their wavelength and amplitude are controlled by the energy of the quasiparticles allowing a direct probe of the graphene dispersion relation. We also observe a faster decay of the LDOS oscillations away from the step edge than in conventional metals. This is due to the chiral nature of the Dirac fermions in graphene.
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