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Pseudospin Magnetism in Graphene

Authors
  • Min, Hongki
  • Borghi, Giovanni
  • Polini, Marco
  • MacDonald, A. H.
Type
Published Article
Publication Date
Jan 17, 2008
Submission Date
Jul 10, 2007
Identifiers
DOI: 10.1103/PhysRevB.77.041407
Source
arXiv
License
Unknown
External links

Abstract

We predict that neutral graphene bilayers are pseudospin magnets in which the charge density-contribution from each valley and spin spontaneously shifts to one of the two layers. The band structure of this system is characterized by a momentum-space vortex which is responsible for unusual competition between band and kinetic energies leading to symmetry breaking in the vortex core. We discuss the possibility of realizing a pseudospin version of ferromagnetic metal spintronics in graphene bilayers based on hysteresis associated with this broken symmetry.

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