Minimum Conductivity and Evidence for Phase Transitions in Ultra-clean Bilayer Graphene

Details Minimum Conductivity and Evidence for Phase Transitions in Ultra-clean Bilayer Graphene Minimum Conductivity and Evidence for Phase Transitions in Ultra-clean Bilayer Graphene

2012-02-15

arxiv.org/abs/1202.3212v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Bilayer graphene (BLG) at the charge neutrality point (CNP) is strongly susceptible to electronic interactions, and expected to undergo a phase transition into a state with spontaneous broken symmetries. By systematically investigating a large number of singly- and doubly-gated bilayer graphene (BLG) devices, we show that an insulating state appears only in devices with high mobility and low extrinsic doping. This insulating state has an associated transition temperature Tc~5K and an energy gap of ~3 meV, thus strongly suggesting a gapped broken symmetry state that is destroyed by very weak disorder. The transition to the intrinsic broken symmetry state can be tuned by disorder, out-of-plane electric field, or carrier density.

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