Distinguishing Spontaneous Quantum Hall States in Graphene Bilayers

Details Distinguishing Spontaneous Quantum Hall States in Graphene Bilayers Distinguishing Spontaneous Quantum Hall States in Graphene Bilayers

2011-07-24

arxiv.org/abs/1107.4727v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages 3 figures and 1 table, submitted and to appear

Scientific paper

Chirally stacked N-layer graphene with N>=2 is susceptible to a variety of distinct broken symmetry states in which each spin-valley flavor spontaneously transfers charge between layers. In mean-field theory the neutral bilayer ground state is a layer antiferromagnet (LAF) state that has opposite spin-polarizations in opposite layers. In this Letter we analyze how the LAF and other competing states are influenced by Zeeman fields that couple to spin and by interlayer electric fields that couple to layer pseudospin, and comment on the possibility of using response and edge state signatures to identify the character of the bilayer ground state experimentally.

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