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Phys Rev Lett. 2012 Sep 21;109(12):126804. Epub 2012 Sep 18.

Quantum Hall to charge-density-wave phase transitions in ABC-trilayer graphene.

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  • 1Department of Physics and Astronomy, University of California, Riverside, 92521, USA.


ABC-stacked trilayer graphene's chiral band structure results in three (n=0, 1, 2) Landau level orbitals with zero kinetic energy. This unique feature has important consequences on the interaction-driven states of the 12-fold degenerate (including spin and valley) N=0 Landau level. In particular, at many filling factors ν(T) = ±5, ±4, ±2, ±1 a quantum phase transition from a quantum Hall liquid state to a triangular charge-density wave occurs as a function of the single particle-induced Landau level orbital splitting Δ(LL). Experimental signatures of this phase transition are also discussed.

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