Pseudospin Magnetism in Graphene

POSTER

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.

Authors

  • Hongki Min

    University of Texas at Austin, Department of Physics, University of Texas, Austin, TX 78712, The University of Texas at Austin

  • Giovanni Borghi

    NEST-CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy, NEST-CNR-INFM and Scuola Normale Superiore, Italy

  • Marco Polini

    NEST-CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy, NEST-CNR-INFM and Scuola Normale Superiore, Italy

  • Allan MacDonald

    University of Texas at Austin, University of Texas, Dept. of Physics, Univ. of Texas at Austin, Department of Physics, University of Texas, Austin, TX 78712, Department of Physics, The University of Texas at Austin, Austin Texas 78712, The University of Texas at Austin, Department of Physics, University of Texas at Austin