2012/08/20 by Juntao Song, Haiwen Liu, Hua Jiang +3
Materials Science · Physics and Astronomy · #Condensed matter physics #Conductance #Gapless playback #Geometry #Graphene #Graphene research and applications #Line (geometry) #Materials science #Physics #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Ribbon #Symmetry (geometry) #Symmetry breaking #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.86.085437
published as Phys. Rev. B 86, 085437 (2012) · 8 pages, 10 figures
openalex publication_date 2012/08/20 · arxiv created 2013/03/04 · arxiv updated 2013/03/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Using a tight-binding model, we study a line defect in graphene where a bulk energy gap is opened by sublattice symmetry breaking. It is found that sublattice symmetry breaking may induce many configurations that correspond to different band spectra. In particular, a gapless state is observed for a configuration which hold a mirror symmetry with respect to the line defect. We find that this gapless state originates from the line defect and is independent of the width of the graphene ribbon, the location of the line defect, and the potentials in the edges of the ribbon. In particular, the gapless state can be controlled by the gate voltage embedded below the line defect. Finally, this result is supported with conductance calculations. This study shows how a quantum channel could be constructed using a line defect, and how the quantum channel can be controlled by tuning the gate voltage embedded below the line defect.