Edge states on graphene ribbon in magnetic field: interplay between Dirac and ferromagnetic-like gaps

Details Edge states on graphene ribbon in magnetic field: interplay between Dirac and ferromagnetic-like gaps Edge states on graphene ribbon in magnetic field: interplay between Dirac and ferromagnetic-like gaps

2008-01-04

arxiv.org/abs/0801.0708v2

Phys. Rev. B 79, 115431 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 7 figures. v2: analysis for ribbons with armchair edges added, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.115431

By combining analytic and numerical methods, edge states on a finite width graphene ribbon in a magnetic field are studied in the framework of low-energy effective theory that takes into account the possibility of quantum Hall ferromagnetism (QHF) gaps and dynamically generated Dirac-like masses. The analysis is done for graphene ribbons with both zigzag and armchair edges. The characteristic features of the spectrum of the edge states in both these cases are described. In particular, the conditions for the existence of the gapless edge states are established. Implications of these results for the interpretation of recent experiments are discussed.

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