Collective edge modes near the onset of a graphene quantum spin Hall state

Ganpathy Murthy, Efrat Shimshoni, H. A. Fertig

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Graphene subject to a strong, tilted magnetic field exhibits an insulator-metal transition tunable by tilt angle, attributed to the transition from a canted antiferromagnetic (CAF) to a ferromagnetic (FM) bulk state at filling factor ν=0. We develop a theoretical description for the spin and valley edge textures in the two phases, and the implied evolution in the nature of edge modes through the transition. In particular, we show that the CAF has gapless neutral modes in the bulk, but supports gapped charged edge modes. At the transition to the FM state the charged edge modes become gapless and are smoothly connected to the helical edge modes of the FM state. Possible experimental consequences are discussed.

Original languageEnglish
Article number241410
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number24
StatePublished - Dec 9 2014

Bibliographical note

Publisher Copyright:
© 2014 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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