Abstract
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 , 1, 2, and 3. Measurements of the activation energy gaps for the 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 charge neutral point show that, similar to single layer graphene, the bilayer becomes insulating at high fields.
- Received 1 October 2009
DOI:https://doi.org/10.1103/PhysRevLett.104.066801
©2010 American Physical Society
Viewpoint
Going eight separate ways
Published 8 February 2010
A very high magnetic field splits the zero-energy Landau level of bilayer graphene revealing eight distinct levels.
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