Pseudospin Magnetism in Graphene

Details Pseudospin Magnetism in Graphene Pseudospin Magnetism in Graphene

2007-07-10

arxiv.org/abs/0707.1530v3

Phys. Rev. B 77, 041407(R) (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures; added figure 1, modified introduction and discussion; updated references

Scientific paper

10.1103/PhysRevB.77.041407

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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