A perpendicular electric field breaks the layer symmetry of Bernal-stacked bilayer graphene, resulting in the opening of a band gap and a modification of the effective mass of the charge carriers. Using scanning tunneling microscopy and spectroscopy, we examine standing waves in the local density of states of bilayer graphene formed by scattering from a bilayer/trilayer boundary. The quasiparticle interference properties are controlled by the bilayer graphene band structure, allowing a direct local probe of the evolution of the band structure of bilayer graphene as a function of electric field. We extract the Slonczewski-Weiss-McClure model tight binding parameters as γ0=3.1 eV, γ1=0.39 eV, and γ4=0.22 eV.
@article{arxiv.1406.0898,
title = {Band Structure Mapping of Bilayer Graphene via Quasiparticle Scattering},
author = {Matthew Yankowitz and Joel I-Jan Wang and Suchun Li and A. Glen Birdwell and Yu-An Chen and Kenji Watanabe and Takashi Taniguchi and Su Ying Quek and Pablo Jarillo-Herrero and Brian J. LeRoy},
journal= {arXiv preprint arXiv:1406.0898},
year = {2015}
}