Journal
NATURE PHYSICS
Volume 9, Issue 3, Pages 154-158Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nphys2528
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Funding
- National Science Foundation
- State of Florida
- US Department of Energy
- AFOSR MURI
- ONR MURI
- PENA
- DOE [DE-FG02-05ER46215]
- U.S. Department of Energy (DOE) [DE-FG02-05ER46215] Funding Source: U.S. Department of Energy (DOE)
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The quantum spin Hall effect is characterized by spin-polarized counter-propagating edge states(1-3). It has been predicted that this edge state configuration could occur in graphene when spin-split electron- and hole-like Landau levels are forced to cross at the edge of the sample(4-6). In particular, a quantum-spin-Hall analogue has been predicted in bilayer graphene with a Landau level filling factor is v = 0 if the ground state is a spin ferromagnet(7). Previous studies have demonstrated that the bilayer v = 0 state is an insulator in a perpendicular magnetic field(8-14), although the exact nature of this state has not been identified. Here we present measurements of the is = 0 state in a dual-gated bilayer graphene device in a tilted magnetic field. We map out a full phase diagram of the is v = 0 state as a function of experimentally tunable in-plane magnetic field and perpendicular electric field. At large in-plane magnetic field we observe a quantum phase transition to a metallic state with conductance of the order of 4e(2)/h, consistent with predictions for the ferromagnet.
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