Will Zigzag Graphene Nanoribbon Turn to Half Metal under Electric Field?

Details Will Zigzag Graphene Nanoribbon Turn to Half Metal under Electric Field? Will Zigzag Graphene Nanoribbon Turn to Half Metal under Electric Field?

2007-08-09

arxiv.org/abs/0708.1213v1

Appl. Phys. Lett 91, 243116 (2007)

Physics

Condensed Matter

Materials Science

8 pages, 3 figures

Scientific paper

10.1063/1.2821112

At B3LYP level of theory, we predict that the half-metallicity in zigzag edge graphene nanoribbon (ZGNR) can be realized when an external electric field is applied across the ribbon. The critical electric field to induce the half-metallicity decreases with the increase of the ribbon width. Both the spin polarization and half-metallicity are removed when the edge state electrons fully transferred from one side to the other under very strong electric field. The electric field range under which ZGNR remain half-metallic increases with the ribbon width. Our study demonstrates a rich field-induced spin polarization behavior, which may leads to some important applications in spinstronics.

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