Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.066801
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Funding
- DOE [DEFG02-05ER46215]
- NSF [DMR-0654118]
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The quantum Hall effect near the charge neutrality point in bilayer graphene is investigated in high magnetic fields of up to 35 T using electronic transport measurements. In the high-field regime, the eightfold degeneracy in the zero-energy Landau level is completely lifted, exhibiting new quantum Hall states corresponding to filling factors nu = 0, 1, 2, and 3. Measurements of the activation energy gaps for the nu = 2 and 3 filling factors in tilted magnetic fields exhibit no appreciable dependence on the in-plane magnetic field, suggesting that these Landau level splittings are independent of spin. In addition, measurements taken at the nu = 0 charge neutral point show that, similar to single layer graphene, the bilayer becomes insulating at high fields.
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