Band structure mapping of bilayer graphene via quasiparticle scattering
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 21, 2014
- Source ID
- 10.1063/1.4890543
Entities
People
- A. Glen Birdwell
- Brian J LeRoy
- Joel I-Jan Wang
- Kenji Watanabe
- Matthew Yankowitz
- Pablo Jarillo-Herrero
- Su Ying Quek
- Suchun Li
- Takashi Taniguchi
- Yu-An Chen
Organizations
- Army Research Office
- Harvard University
- Massachusetts Institute of Technology
- National Institute for Materials Science
- National Research Foundation
- National Science Foundation
- National University of Singapore
- Office of Naval Research
- United States Army Research Laboratory
- University of Arizona