Long wavelength local density of states oscillations near graphene step edges

Details Long wavelength local density of states oscillations near graphene step edges Long wavelength local density of states oscillations near graphene step edges

2011-11-10

arxiv.org/abs/1111.2548v1

Phys. Rev. Lett. 108, 016801 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.108.016801

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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