1. Heavy Dirac fermions in a graphene/topological insulator hetero-junction
- Author
-
Gang Yang, Chao-Xing Liu, Rui-Xing Zhang, Wenhui Duan, Jorge O. Sofo, Peizhe Tang, and Wendong Cao
- Subjects
High Energy Physics::Lattice ,FOS: Physical sciences ,02 engineering and technology ,Quantum Hall effect ,01 natural sciences ,law.invention ,symbols.namesake ,Gapless playback ,Ab initio quantum chemistry methods ,law ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,0103 physical sciences ,General Materials Science ,010306 general physics ,Surface states ,Condensed Matter::Quantum Gases ,Physics ,Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed matter physics ,Graphene ,Mechanical Engineering ,Fermi energy ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Dirac fermion ,Mechanics of Materials ,Topological insulator ,symbols ,0210 nano-technology - Abstract
The low energy physics of both graphene and surface states of three-dimensional topological insulators is described by gapless Dirac fermions with linear dispersion. In this work, we predict the emergence of a "heavy" Dirac fermion in a graphene/topological insulator hetero-junction, where the linear term almost vanishes and the corresponding energy dispersion becomes highly non-linear. By combining {\it ab initio} calculations and an effective low-energy model, we show explicitly how strong hybridization between Dirac fermions in graphene and the surface states of topological insulators can reduce the Fermi velocity of Dirac fermions. Due to the negligible linear term, interaction effects will be greatly enhanced and can drive "heavy" Dirac fermion states into the half quantum Hall state with non-zero Hall conductance., 2 figures
- Published
- 2016
- Full Text
- View/download PDF