Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.016801
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Funding
- NSF [EECS/0925152, CAREER DMR/0953784]
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0001819]
- US Office of Naval Research Multi University Research Initiative (MURI) on Graphene Advanced Terahertz Engineering (Gate) at MIT, Harvard
- Boston University
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0925152] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [23310096, 23246116] Funding Source: KAKEN
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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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