Composite fermion dynamics in half-filled Landau levels of graphene

Details Composite fermion dynamics in half-filled Landau levels of graphene Composite fermion dynamics in half-filled Landau levels of graphene

2010-07-18

arxiv.org/abs/1007.3006v2

Acta Phys.Polon.A119:592,2011

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 4 figures (revision: reference update)

Scientific paper

We report on exact-diagonalization studies of correlated many-electron states in the half-filled Landau levels of graphene, including pseudospin (valley) degeneracy. We demonstrate that the polarized Fermi sea of non-interacting composite fermions remains stable against a pairing transition in the lowest two Landau levels. However, it undergoes spontaneous depolarization, which is unprotected owing to the lack of single-particle pseudospin splitting. These results suggest the absence of the Pfaffian phase in graphene.

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