Congratulations to Javier and our collaborators at Brian Leroy’s group at University of Arizona for their new publication in Physical Review Letters.
Long wavelength local density of states oscillations near graphene step edges
Jiamin Xue, Javier Sanchez-Yamagishi, K. Watanabe, T. Taniguchi, Pablo Jarillo-Herrero, Brian J. LeRoy
Phys. Rev. Lett., 108, 016801 (2012)
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.